87728140 has 24 divisors (see below), whose sum is σ = 190173312. Its totient is φ = 33959040.

The previous prime is 87728117. The next prime is 87728153. The reversal of 87728140 is 4182778.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 87728140.

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, 70129 + ... + 71368.

It is an arithmetic number, because the mean of its divisors is an integer number (7923888).

Almost surely, 2^87728140 is an apocalyptic number.

It is an amenable number.

87728140 is an abundant number, since it is smaller than the sum of its proper divisors (102445172).

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

87728140 is a wasteful number, since it uses less digits than its factorization.

87728140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141537 (or 141535 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 87728140 is about 9366.3301244404. The cubic root of 87728140 is about 444.3375068181.

The spelling of 87728140 in words is "eighty-seven million, seven hundred twenty-eight thousand, one hundred forty".