77916480 has 56 divisors (see below), whose sum is σ = 247387872. Its totient is φ = 20777472.

The previous prime is 77916467. The next prime is 77916481. The reversal of 77916480 is 8461977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77916481) 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, 39622 + ... + 41541.

Almost surely, 2^77916480 is an apocalyptic number.

It is an amenable number.

77916480 is an abundant number, since it is smaller than the sum of its proper divisors (169471392).

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

77916480 is a wasteful number, since it uses less digits than its factorization.

77916480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81183 (or 81173 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 77916480 is about 8827.0312110018. The cubic root of 77916480 is about 427.1133126579.

The spelling of 77916480 in words is "seventy-seven million, nine hundred sixteen thousand, four hundred eighty".