87445540 has 96 divisors (see below), whose sum is σ = 235952640. Its totient is φ = 26459136.

The previous prime is 87445537. The next prime is 87445549. The reversal of 87445540 is 4554478.

It is a self number, because there is not a number n which added to its sum of digits gives 87445540.

It is not an unprimeable number, because it can be changed into a prime (87445549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40816 + ... + 42904.

It is an arithmetic number, because the mean of its divisors is an integer number (2457840).

Almost surely, 2^87445540 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 87445540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117976320).

87445540 is an abundant number, since it is smaller than the sum of its proper divisors (148507100).

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

87445540 is a wasteful number, since it uses less digits than its factorization.

87445540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141 (or 2139 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 37.

The square root of 87445540 is about 9351.2320043939. The cubic root of 87445540 is about 443.8598765141.

The spelling of 87445540 in words is "eighty-seven million, four hundred forty-five thousand, five hundred forty".