69978240 has 96 divisors (see below), whose sum is σ = 241663500. Its totient is φ = 18659328.

The previous prime is 69978203. The next prime is 69978269. The reversal of 69978240 is 4287996.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65415744 + 4562496 = 8088^2 + 2136^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315 + ... + 11834.

Almost surely, 2^69978240 is an apocalyptic number.

69978240 is a gapful number since it is divisible by the number (60) 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 69978240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120831750).

69978240 is an abundant number, since it is smaller than the sum of its proper divisors (171685260).

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

69978240 is a wasteful number, since it uses less digits than its factorization.

69978240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12174 (or 12159 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 69978240 is about 8365.2997555378. The cubic root of 69978240 is about 412.0858211893.

The spelling of 69978240 in words is "sixty-nine million, nine hundred seventy-eight thousand, two hundred forty".