87997140 has 216 divisors, whose sum is σ = 339105312. Its totient is φ = 18264960.

The previous prime is 87997109. The next prime is 87997199. The reversal of 87997140 is 4179978.

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 71 ways as a sum of consecutive naturals, for example, 96567 + ... + 97473.

It is an arithmetic number, because the mean of its divisors is an integer number (1569932).

Almost surely, 2^87997140 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 87997140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169552656).

87997140 is an abundant number, since it is smaller than the sum of its proper divisors (251108172).

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

87997140 is a wasteful number, since it uses less digits than its factorization.

87997140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 935 counting only the distinct ones).

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

The square root of 87997140 is about 9380.6790798961. The cubic root of 87997140 is about 444.7911994381.

The spelling of 87997140 in words is "eighty-seven million, nine hundred ninety-seven thousand, one hundred forty".