64987240 has 16 divisors (see below), whose sum is σ = 146221380. Its totient is φ = 25994880.

The previous prime is 64987193. The next prime is 64987313. The reversal of 64987240 is 4278946.

It can be written as a sum of positive squares in 2 ways, for example, as 57729604 + 7257636 = 7598^2 + 2694^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1624681 = 64987240 / (6 + 4 + 9 + 8 + 7 + 2 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 64987193 and 64987202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812301 + ... + 812380.

Almost surely, 2^64987240 is an apocalyptic number.

It is an amenable number.

64987240 is an abundant number, since it is smaller than the sum of its proper divisors (81234140).

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

64987240 is a wasteful number, since it uses less digits than its factorization.

64987240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624692 (or 1624688 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 64987240 is about 8061.4663678514. The cubic root of 64987240 is about 402.0462641573.

The spelling of 64987240 in words is "sixty-four million, nine hundred eighty-seven thousand, two hundred forty".