87791580 has 48 divisors (see below), whose sum is σ = 273131040. Its totient is φ = 23410944.

The previous prime is 87791573. The next prime is 87791581. The reversal of 87791580 is 8519778.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87791581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80749 + ... + 81828.

It is an arithmetic number, because the mean of its divisors is an integer number (5690230).

Almost surely, 2^87791580 is an apocalyptic number.

It is an amenable number.

87791580 is an abundant number, since it is smaller than the sum of its proper divisors (185339460).

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

87791580 is a wasteful number, since it uses less digits than its factorization.

87791580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162595 (or 162587 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 87791580 is about 9369.7161109609. The cubic root of 87791580 is about 444.4445875463. Note that the first 3 decimals are identical.

The spelling of 87791580 in words is "eighty-seven million, seven hundred ninety-one thousand, five hundred eighty".