77731404 has 24 divisors (see below), whose sum is σ = 182138880. Its totient is φ = 25801104.

The previous prime is 77731403. The next prime is 77731411. The reversal of 77731404 is 40413777.

It is a super-2 number, since 2×77731404² = 12084342335622432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77731403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10684 + ... + 16419.

It is an arithmetic number, because the mean of its divisors is an integer number (7589120).

Almost surely, 2^77731404 is an apocalyptic number.

It is an amenable number.

77731404 is an abundant number, since it is smaller than the sum of its proper divisors (104407476).

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

77731404 is a wasteful number, since it uses less digits than its factorization.

77731404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27349 (or 27347 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 77731404 is about 8816.5414987965. The cubic root of 77731404 is about 426.7748686624.

The spelling of 77731404 in words is "seventy-seven million, seven hundred thirty-one thousand, four hundred four".