78700040 has 16 divisors (see below), whose sum is σ = 177075180. Its totient is φ = 31480000.

The previous prime is 78700031. The next prime is 78700051. The reversal of 78700040 is 4000787.

It can be written as a sum of positive squares in 2 ways, for example, as 77827684 + 872356 = 8822^2 + 934^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78699982 and 78700009.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983711 + ... + 983790.

Almost surely, 2^78700040 is an apocalyptic number.

It is an amenable number.

78700040 is an abundant number, since it is smaller than the sum of its proper divisors (98375140).

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

78700040 is a wasteful number, since it uses less digits than its factorization.

78700040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967512 (or 1967508 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 78700040 is about 8871.3043009470. The cubic root of 78700040 is about 428.5402819693.

The spelling of 78700040 in words is "seventy-eight million, seven hundred thousand, forty".