640900348 has 48 divisors (see below), whose sum is σ = 1278516960. Its totient is φ = 278432000.

The previous prime is 640900331. The next prime is 640900349. The reversal of 640900348 is 843009046.

It is a super-2 number, since 2×640900348² = 821506512133042208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640900349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126390 + ... + 131362.

It is an arithmetic number, because the mean of its divisors is an integer number (26635770).

Almost surely, 2^640900348 is an apocalyptic number.

It is an amenable number.

640900348 is a deficient number, since it is larger than the sum of its proper divisors (637616612).

640900348 is a wasteful number, since it uses less digits than its factorization.

640900348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118 (or 5116 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 640900348 is about 25316.0097171730. The cubic root of 640900348 is about 862.1777993605.

The spelling of 640900348 in words is "six hundred forty million, nine hundred thousand, three hundred forty-eight".