640458070 has 16 divisors (see below), whose sum is σ = 1317513888. Its totient is φ = 219585600.

The previous prime is 640458067. The next prime is 640458073. The reversal of 640458070 is 70854046.

640458070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640458067) and next prime (640458073).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640458073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4574631 + ... + 4574770.

It is an arithmetic number, because the mean of its divisors is an integer number (82344618).

Almost surely, 2^640458070 is an apocalyptic number.

640458070 is an abundant number, since it is smaller than the sum of its proper divisors (677055818).

640458070 is a wasteful number, since it uses less digits than its factorization.

640458070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9149415.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 640458070 is about 25307.2730652672. The cubic root of 640458070 is about 861.9794273760.

The spelling of 640458070 in words is "six hundred forty million, four hundred fifty-eight thousand, seventy".