77989892 has 6 divisors (see below), whose sum is σ = 136482318. Its totient is φ = 38994944.

The previous prime is 77989883. The next prime is 77989909. The reversal of 77989892 is 29898977.

It can be written as a sum of positive squares in only one way, i.e., 61716736 + 16273156 = 7856^2 + 4034^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9748733 + ... + 9748740.

It is an arithmetic number, because the mean of its divisors is an integer number (22747053).

Almost surely, 2^77989892 is an apocalyptic number.

It is an amenable number.

77989892 is a deficient number, since it is larger than the sum of its proper divisors (58492426).

77989892 is a wasteful number, since it uses less digits than its factorization.

77989892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19497477 (or 19497475 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 59.

The square root of 77989892 is about 8831.1885949741. The cubic root of 77989892 is about 427.2474109477.

The spelling of 77989892 in words is "seventy-seven million, nine hundred eighty-nine thousand, eight hundred ninety-two".