640024684 has 48 divisors (see below), whose sum is σ = 1233388800. Its totient is φ = 288795456.

The previous prime is 640024643. The next prime is 640024717. The reversal of 640024684 is 486420046.

It is a happy number.

It is a super-2 number, since 2×640024684² = 819263192258599712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695977 + ... + 696895.

It is an arithmetic number, because the mean of its divisors is an integer number (25695600).

Almost surely, 2^640024684 is an apocalyptic number.

It is an amenable number.

640024684 is a deficient number, since it is larger than the sum of its proper divisors (593364116).

640024684 is a wasteful number, since it uses less digits than its factorization.

640024684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 640024684 is about 25298.7091370291. The cubic root of 640024684 is about 861.7849550507.

It can be divided in two parts, 64002 and 4684, that added together give a palindrome (68686).

The spelling of 640024684 in words is "six hundred forty million, twenty-four thousand, six hundred eighty-four".