77689892 has 18 divisors (see below), whose sum is σ = 158154822. Its totient is φ = 33295584.

The previous prime is 77689861. The next prime is 77689897. The reversal of 77689892 is 29898677.

It can be written as a sum of positive squares in only one way, i.e., 53816896 + 23872996 = 7336^2 + 4886^2 .

It is not an unprimeable number, because it can be changed into a prime (77689897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197993 + ... + 198384.

It is an arithmetic number, because the mean of its divisors is an integer number (8786379).

Almost surely, 2^77689892 is an apocalyptic number.

It is an amenable number.

77689892 is an abundant number, since it is smaller than the sum of its proper divisors (80464930).

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

77689892 is a wasteful number, since it uses less digits than its factorization.

77689892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396395 (or 396386 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 56.

The square root of 77689892 is about 8814.1869732835. The cubic root of 77689892 is about 426.6988829298.

The spelling of 77689892 in words is "seventy-seven million, six hundred eighty-nine thousand, eight hundred ninety-two".