87728392 has 8 divisors (see below), whose sum is σ = 164490750. Its totient is φ = 43864192.

The previous prime is 87728383. The next prime is 87728411. The reversal of 87728392 is 29382778.

It can be written as a sum of positive squares in only one way, i.e., 57851236 + 29877156 = 7606^2 + 5466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5483017 + ... + 5483032.

Almost surely, 2^87728392 is an apocalyptic number.

It is an amenable number.

87728392 is a deficient number, since it is larger than the sum of its proper divisors (76762358).

87728392 is a wasteful number, since it uses less digits than its factorization.

87728392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10966055 (or 10966051 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 87728392 is about 9366.3435768714. The cubic root of 87728392 is about 444.3379322724.

It can be divided in two parts, 8 and 7728392, that added together give a square (7728400 = 2780²).

The spelling of 87728392 in words is "eighty-seven million, seven hundred twenty-eight thousand, three hundred ninety-two".