142878240 has 144 divisors (see below), whose sum is σ = 490672728. Its totient is φ = 37859328.

The previous prime is 142878223. The next prime is 142878247. The reversal of 142878240 is 42878241.

It can be written as a sum of positive squares in 4 ways, for example, as 30603024 + 112275216 = 5532^2 + 10596^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 142878195 and 142878204.

It is not an unprimeable number, because it can be changed into a prime (142878247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 450562 + ... + 450878.

Almost surely, 2^142878240 is an apocalyptic number.

142878240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142878240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245336364).

142878240 is an abundant number, since it is smaller than the sum of its proper divisors (347794488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142878240 is a wasteful number, since it uses less digits than its factorization.

142878240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 142878240 is about 11953.1686175675. The cubic root of 142878240 is about 522.7836909398.

Subtracting from 142878240 its reverse (42878241), we obtain a palindrome (99999999).

The spelling of 142878240 in words is "one hundred forty-two million, eight hundred seventy-eight thousand, two hundred forty".