77613992 has 16 divisors (see below), whose sum is σ = 145637460. Its totient is φ = 38777344.

The previous prime is 77613989. The next prime is 77613997. The reversal of 77613992 is 29931677.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 69122596 + 8491396 = 8314^2 + 2914^2 .

It is not an unprimeable number, because it can be changed into a prime (77613997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10718 + ... + 16434.

Almost surely, 2^77613992 is an apocalyptic number.

It is an amenable number.

77613992 is a deficient number, since it is larger than the sum of its proper divisors (68023468).

77613992 is a wasteful number, since it uses less digits than its factorization.

77613992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420 (or 7416 counting only the distinct ones).

The product of its digits is 142884, while the sum is 44.

The square root of 77613992 is about 8809.8803624113. The cubic root of 77613992 is about 426.5598815880.

The spelling of 77613992 in words is "seventy-seven million, six hundred thirteen thousand, nine hundred ninety-two".