77904532 has 12 divisors (see below), whose sum is σ = 137683476. Its totient is φ = 38566400.

The previous prime is 77904517. The next prime is 77904539. The reversal of 77904532 is 23540977.

It can be written as a sum of positive squares in 2 ways, for example, as 31854736 + 46049796 = 5644^2 + 6786^2 .

It is a super-2 number, since 2×77904532² = 12138232212278048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77904491 and 77904500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77904539) 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, 96013 + ... + 96820.

It is an arithmetic number, because the mean of its divisors is an integer number (11473623).

Almost surely, 2^77904532 is an apocalyptic number.

It is an amenable number.

77904532 is a deficient number, since it is larger than the sum of its proper divisors (59778944).

77904532 is a wasteful number, since it uses less digits than its factorization.

77904532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192938 (or 192936 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 77904532 is about 8826.3544003173. The cubic root of 77904532 is about 427.0914798324.

The spelling of 77904532 in words is "seventy-seven million, nine hundred four thousand, five hundred thirty-two".