64587240 has 128 divisors (see below), whose sum is σ = 218304000. Its totient is φ = 16982784.

The previous prime is 64587239. The next prime is 64587253. The reversal of 64587240 is 4278546.

64587240 is a `hidden beast` number, since 645 + 8 + 7 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64587195 and 64587204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84942 + ... + 85698.

It is an arithmetic number, because the mean of its divisors is an integer number (1705500).

Almost surely, 2^64587240 is an apocalyptic number.

64587240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64587240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109152000).

64587240 is an abundant number, since it is smaller than the sum of its proper divisors (153716760).

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

64587240 is a wasteful number, since it uses less digits than its factorization.

64587240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 64587240 is about 8036.6186919624. The cubic root of 64587240 is about 401.2196937544.

The spelling of 64587240 in words is "sixty-four million, five hundred eighty-seven thousand, two hundred forty".