640223016 has 32 divisors (see below), whose sum is σ = 1601544960. Its totient is φ = 213276032.

The previous prime is 640222997. The next prime is 640223021. The reversal of 640223016 is 610322046.

It is a super-2 number, since 2×640223016² = 819771020432272512, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36436 + ... + 51068.

It is an arithmetic number, because the mean of its divisors is an integer number (50048280).

Almost surely, 2^640223016 is an apocalyptic number.

It is an amenable number.

640223016 is an abundant number, since it is smaller than the sum of its proper divisors (961321944).

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

640223016 is a wasteful number, since it uses less digits than its factorization.

640223016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16465 (or 16461 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 640223016 is about 25302.6286381475. The cubic root of 640223016 is about 861.8739630146.

The spelling of 640223016 in words is "six hundred forty million, two hundred twenty-three thousand, sixteen".