77891692 has 12 divisors (see below), whose sum is σ = 136425240. Its totient is φ = 38913056.

The previous prime is 77891641. The next prime is 77891699. The reversal of 77891692 is 29619877.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77891699) 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, 2398 + ... + 12709.

It is an arithmetic number, because the mean of its divisors is an integer number (11368770).

Almost surely, 2^77891692 is an apocalyptic number.

It is an amenable number.

77891692 is a deficient number, since it is larger than the sum of its proper divisors (58533548).

77891692 is a wasteful number, since it uses less digits than its factorization.

77891692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16400 (or 16398 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 77891692 is about 8825.6270032219. The cubic root of 77891692 is about 427.0680145484.

The spelling of 77891692 in words is "seventy-seven million, eight hundred ninety-one thousand, six hundred ninety-two".