87715428 has 12 divisors (see below), whose sum is σ = 204669360. Its totient is φ = 29238472.

The previous prime is 87715421. The next prime is 87715469. The reversal of 87715428 is 82451778.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 87715428.

It is not an unprimeable number, because it can be changed into a prime (87715421) 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, 3654798 + ... + 3654821.

It is an arithmetic number, because the mean of its divisors is an integer number (17055780).

Almost surely, 2^87715428 is an apocalyptic number.

It is an amenable number.

87715428 is an abundant number, since it is smaller than the sum of its proper divisors (116953932).

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

87715428 is a wasteful number, since it uses less digits than its factorization.

87715428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7309626 (or 7309624 counting only the distinct ones).

The product of its digits is 125440, while the sum is 42.

The square root of 87715428 is about 9365.6514989615. The cubic root of 87715428 is about 444.3160439548.

The spelling of 87715428 in words is "eighty-seven million, seven hundred fifteen thousand, four hundred twenty-eight".