87237640 has 96 divisors (see below), whose sum is σ = 233435520. Its totient is φ = 29242752.

The previous prime is 87237637. The next prime is 87237649. The reversal of 87237640 is 4673278.

It is a super-2 number, since 2×87237640² = 15220811665539200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87237640.

It is not an unprimeable number, because it can be changed into a prime (87237649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91647 + ... + 92593.

It is an arithmetic number, because the mean of its divisors is an integer number (2431620).

Almost surely, 2^87237640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87237640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116717760).

87237640 is an abundant number, since it is smaller than the sum of its proper divisors (146197880).

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

87237640 is a wasteful number, since it uses less digits than its factorization.

87237640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 87237640 is about 9340.1092070703. The cubic root of 87237640 is about 443.5078414260.

The spelling of 87237640 in words is "eighty-seven million, two hundred thirty-seven thousand, six hundred forty".