87811320 has 32 divisors (see below), whose sum is σ = 263434320. Its totient is φ = 23416320.

The previous prime is 87811303. The next prime is 87811343. The reversal of 87811320 is 2311878.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 365761 + ... + 366000.

Almost surely, 2^87811320 is an apocalyptic number.

It is an amenable number.

87811320 is an abundant number, since it is smaller than the sum of its proper divisors (175623000).

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

87811320 is a wasteful number, since it uses less digits than its factorization.

87811320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731775 (or 731771 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 87811320 is about 9370.7694454618. The cubic root of 87811320 is about 444.4778962784.

It can be divided in two parts, 8781 and 1320, that added together give a palindrome (10101).

The spelling of 87811320 in words is "eighty-seven million, eight hundred eleven thousand, three hundred twenty".