640015224 has 32 divisors (see below), whose sum is σ = 1600667520. Its totient is φ = 213254496.

The previous prime is 640015217. The next prime is 640015231. The reversal of 640015224 is 422510046.

It is an interprime number because it is at equal distance from previous prime (640015217) and next prime (640015231).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 640015194 and 640015203.

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, 100767 + ... + 106929.

It is an arithmetic number, because the mean of its divisors is an integer number (50020860).

Almost surely, 2^640015224 is an apocalyptic number.

It is an amenable number.

640015224 is an abundant number, since it is smaller than the sum of its proper divisors (960652296).

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

640015224 is a wasteful number, since it uses less digits than its factorization.

640015224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10499 (or 10495 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 640015224 is about 25298.5221702771. The cubic root of 640015224 is about 861.7807091073.

The spelling of 640015224 in words is "six hundred forty million, fifteen thousand, two hundred twenty-four".