87715220 has 24 divisors (see below), whose sum is σ = 185136000. Its totient is φ = 34908192.

The previous prime is 87715211. The next prime is 87715237. The reversal of 87715220 is 2251778.

It is a congruent number.

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, 7040 + ... + 14999.

It is an arithmetic number, because the mean of its divisors is an integer number (7714000).

Almost surely, 2^87715220 is an apocalyptic number.

It is an amenable number.

87715220 is an abundant number, since it is smaller than the sum of its proper divisors (97420780).

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

87715220 is a wasteful number, since it uses less digits than its factorization.

87715220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22247 (or 22245 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 87715220 is about 9365.6403945486. The cubic root of 87715220 is about 444.3156927517.

Adding to 87715220 its reverse (2251778), we get a palindrome (89966998).

The spelling of 87715220 in words is "eighty-seven million, seven hundred fifteen thousand, two hundred twenty".