77855488 has 36 divisors (see below), whose sum is σ = 160781040. Its totient is φ = 37581824.

The previous prime is 77855473. The next prime is 77855501. The reversal of 77855488 is 88455877.

It is a happy number.

It is a super-2 number, since 2×77855488² = 12122954023436288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181 + ... + 12667.

It is an arithmetic number, because the mean of its divisors is an integer number (4466140).

Almost surely, 2^77855488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77855488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80390520).

77855488 is an abundant number, since it is smaller than the sum of its proper divisors (82925552).

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

77855488 is a wasteful number, since it uses less digits than its factorization.

77855488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532 (or 10518 counting only the distinct ones).

The product of its digits is 2508800, while the sum is 52.

The square root of 77855488 is about 8823.5756924276. The cubic root of 77855488 is about 427.0018373301.

The spelling of 77855488 in words is "seventy-seven million, eight hundred fifty-five thousand, four hundred eighty-eight".