78687240 has 32 divisors (see below), whose sum is σ = 236062080. Its totient is φ = 20983232.

The previous prime is 78687199. The next prime is 78687247. The reversal of 78687240 is 4278687.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78687192 and 78687201.

It is not an unprimeable number, because it can be changed into a prime (78687247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327744 + ... + 327983.

It is an arithmetic number, because the mean of its divisors is an integer number (7376940).

Almost surely, 2^78687240 is an apocalyptic number.

It is an amenable number.

78687240 is an abundant number, since it is smaller than the sum of its proper divisors (157374840).

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

78687240 is a wasteful number, since it uses less digits than its factorization.

78687240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655741 (or 655737 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 78687240 is about 8870.5828444359. The cubic root of 78687240 is about 428.5170477031.

The spelling of 78687240 in words is "seventy-eight million, six hundred eighty-seven thousand, two hundred forty".