87197940 has 72 divisors (see below), whose sum is σ = 268265088. Its totient is φ = 22921920.

The previous prime is 87197917. The next prime is 87197951. The reversal of 87197940 is 4979178.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9369 + ... + 16191.

It is an arithmetic number, because the mean of its divisors is an integer number (3725904).

Almost surely, 2^87197940 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 87197940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134132544).

87197940 is an abundant number, since it is smaller than the sum of its proper divisors (181067148).

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

87197940 is a wasteful number, since it uses less digits than its factorization.

87197940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909 (or 6904 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 87197940 is about 9337.9837224103. The cubic root of 87197940 is about 443.4405542135.

The spelling of 87197940 in words is "eighty-seven million, one hundred ninety-seven thousand, nine hundred forty".