87658440 has 32 divisors (see below), whose sum is σ = 262975680. Its totient is φ = 23375552.

The previous prime is 87658429. The next prime is 87658463. The reversal of 87658440 is 4485678.

It is a junction number, because it is equal to n+sod(n) for n = 87658392 and 87658401.

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, 365124 + ... + 365363.

It is an arithmetic number, because the mean of its divisors is an integer number (8217990).

Almost surely, 2^87658440 is an apocalyptic number.

It is an amenable number.

87658440 is an abundant number, since it is smaller than the sum of its proper divisors (175317240).

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

87658440 is a wasteful number, since it uses less digits than its factorization.

87658440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730501 (or 730497 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 87658440 is about 9362.6086108520. The cubic root of 87658440 is about 444.2198002692.

It can be divided in two parts, 8765 and 8440, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 87658440 in words is "eighty-seven million, six hundred fifty-eight thousand, four hundred forty".