142278640 has 80 divisors (see below), whose sum is σ = 391135680. Its totient is φ = 47093760.

The previous prime is 142278637. The next prime is 142278641. The reversal of 142278640 is 46872241.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×142278640² = 40486422800499200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 142278596 and 142278605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142278641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11860 + ... + 20620.

It is an arithmetic number, because the mean of its divisors is an integer number (4889196).

Almost surely, 2^142278640 is an apocalyptic number.

142278640 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 142278640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195567840).

142278640 is an abundant number, since it is smaller than the sum of its proper divisors (248857040).

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

142278640 is a wasteful number, since it uses less digits than its factorization.

142278640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8810 (or 8804 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 142278640 is about 11928.0610327077. The cubic root of 142278640 is about 522.0513643227.

The spelling of 142278640 in words is "one hundred forty-two million, two hundred seventy-eight thousand, six hundred forty".