87397740 has 36 divisors (see below), whose sum is σ = 265107024. Its totient is φ = 23306016.

The previous prime is 87397729. The next prime is 87397741. The reversal of 87397740 is 4779378.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (87397741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242592 + ... + 242951.

It is an arithmetic number, because the mean of its divisors is an integer number (7364084).

Almost surely, 2^87397740 is an apocalyptic number.

It is an amenable number.

87397740 is an abundant number, since it is smaller than the sum of its proper divisors (177709284).

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

87397740 is a wasteful number, since it uses less digits than its factorization.

87397740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485558 (or 485553 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 87397740 is about 9348.6758420645. The cubic root of 87397740 is about 443.7789866670.

The spelling of 87397740 in words is "eighty-seven million, three hundred ninety-seven thousand, seven hundred forty".