77940756 has 36 divisors (see below), whose sum is σ = 197674932. Its totient is φ = 25893504.

The previous prime is 77940749. The next prime is 77940763. The reversal of 77940756 is 65704977.

It is an interprime number because it is at equal distance from previous prime (77940749) and next prime (77940763).

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 59536656 = 4290^2 + 7716^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×77940756² = 12149522891703072, which contains 22 as substring.

It is a congruent number.

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, 7810 + ... + 14726.

Almost surely, 2^77940756 is an apocalyptic number.

It is an amenable number.

77940756 is an abundant number, since it is smaller than the sum of its proper divisors (119734176).

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

77940756 is a wasteful number, since it uses less digits than its factorization.

77940756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7240 (or 7235 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The square root of 77940756 is about 8828.4061981764. The cubic root of 77940756 is about 427.1576658172.

The spelling of 77940756 in words is "seventy-seven million, nine hundred forty thousand, seven hundred fifty-six".