87561320 has 64 divisors (see below), whose sum is σ = 245635200. Its totient is φ = 27290880.

The previous prime is 87561319. The next prime is 87561349. The reversal of 87561320 is 2316578.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11135 + ... + 17294.

It is an arithmetic number, because the mean of its divisors is an integer number (3838050).

Almost surely, 2^87561320 is an apocalyptic number.

It is an amenable number.

87561320 is an abundant number, since it is smaller than the sum of its proper divisors (158073880).

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

87561320 is a wasteful number, since it uses less digits than its factorization.

87561320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28458 (or 28454 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 87561320 is about 9357.4205847552. The cubic root of 87561320 is about 444.0556838421.

Adding to 87561320 its reverse (2316578), we get a palindrome (89877898).

The spelling of 87561320 in words is "eighty-seven million, five hundred sixty-one thousand, three hundred twenty".