78756940 has 48 divisors (see below), whose sum is σ = 169827840. Its totient is φ = 30667520.

The previous prime is 78756929. The next prime is 78756943. The reversal of 78756940 is 4965787.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78756943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202266 + ... + 202654.

It is an arithmetic number, because the mean of its divisors is an integer number (3538080).

Almost surely, 2^78756940 is an apocalyptic number.

It is an amenable number.

78756940 is an abundant number, since it is smaller than the sum of its proper divisors (91070900).

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

78756940 is a wasteful number, since it uses less digits than its factorization.

78756940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 78756940 is about 8874.5106907367. The cubic root of 78756940 is about 428.6435350633.

The spelling of 78756940 in words is "seventy-eight million, seven hundred fifty-six thousand, nine hundred forty".