77913488 has 20 divisors (see below), whose sum is σ = 156163740. Its totient is φ = 37613184.

The previous prime is 77913481. The next prime is 77913497. The reversal of 77913488 is 88431977.

It can be written as a sum of positive squares in 2 ways, for example, as 36336784 + 41576704 = 6028^2 + 6448^2 .

It is a super-4 number, since 4×77913488⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (77913481) 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, 83495 + ... + 84422.

It is an arithmetic number, because the mean of its divisors is an integer number (7808187).

Almost surely, 2^77913488 is an apocalyptic number.

It is an amenable number.

77913488 is an abundant number, since it is smaller than the sum of its proper divisors (78250252).

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

77913488 is a wasteful number, since it uses less digits than its factorization.

77913488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167954 (or 167948 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 77913488 is about 8826.8617299695. The cubic root of 77913488 is about 427.1078455244.

The spelling of 77913488 in words is "seventy-seven million, nine hundred thirteen thousand, four hundred eighty-eight".