640231024 has 20 divisors (see below), whose sum is σ = 1257442336. Its totient is φ = 315729792.

The previous prime is 640231019. The next prime is 640231037. The reversal of 640231024 is 420132046.

It is a happy number.

It is a super-3 number, since 3×640231024³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640230986 and 640231004.

It is a congruent number.

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, 272904 + ... + 275239.

Almost surely, 2^640231024 is an apocalyptic number.

It is an amenable number.

640231024 is a deficient number, since it is larger than the sum of its proper divisors (617211312).

640231024 is a wasteful number, since it uses less digits than its factorization.

640231024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548224 (or 548218 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 640231024 is about 25302.7868820808. The cubic root of 640231024 is about 861.8775564800.

The spelling of 640231024 in words is "six hundred forty million, two hundred thirty-one thousand, twenty-four".