87289740 has 72 divisors (see below), whose sum is σ = 265749120. Its totient is φ = 23192064.

The previous prime is 87289729. The next prime is 87289757. The reversal of 87289740 is 4798278.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

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, 59941 + ... + 61379.

It is an arithmetic number, because the mean of its divisors is an integer number (3690960).

Almost surely, 2^87289740 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 87289740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132874560).

87289740 is an abundant number, since it is smaller than the sum of its proper divisors (178459380).

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

87289740 is a wasteful number, since it uses less digits than its factorization.

87289740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 87289740 is about 9342.8978373950. The cubic root of 87289740 is about 443.5961143326.

The spelling of 87289740 in words is "eighty-seven million, two hundred eighty-nine thousand, seven hundred forty".