87219740 has 24 divisors (see below), whose sum is σ = 189071232. Its totient is φ = 33762240.

The previous prime is 87219731. The next prime is 87219757. The reversal of 87219740 is 4791278.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 87219694 and 87219703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69719 + ... + 70958.

It is an arithmetic number, because the mean of its divisors is an integer number (7877968).

Almost surely, 2^87219740 is an apocalyptic number.

It is an amenable number.

87219740 is an abundant number, since it is smaller than the sum of its proper divisors (101851492).

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

87219740 is a wasteful number, since it uses less digits than its factorization.

87219740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140717 (or 140715 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 87219740 is about 9339.1509250038. The cubic root of 87219740 is about 443.4775053868.

The spelling of 87219740 in words is "eighty-seven million, two hundred nineteen thousand, seven hundred forty".