87772728 has 32 divisors (see below), whose sum is σ = 220412160. Its totient is φ = 29126880.

The previous prime is 87772709. The next prime is 87772739. The reversal of 87772728 is 82727778.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2608 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (6887880).

Almost surely, 2^87772728 is an apocalyptic number.

It is an amenable number.

87772728 is an abundant number, since it is smaller than the sum of its proper divisors (132639432).

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

87772728 is a wasteful number, since it uses less digits than its factorization.

87772728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16347 (or 16343 counting only the distinct ones).

The product of its digits is 614656, while the sum is 48.

The square root of 87772728 is about 9368.7100499482. The cubic root of 87772728 is about 444.4127725394.

The spelling of 87772728 in words is "eighty-seven million, seven hundred seventy-two thousand, seven hundred twenty-eight".