640267070 has 32 divisors (see below), whose sum is σ = 1182970656. Its totient is φ = 249356800.

The previous prime is 640267021. The next prime is 640267079. The reversal of 640267070 is 70762046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640267079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251705 + ... + 254235.

It is an arithmetic number, because the mean of its divisors is an integer number (36967833).

Almost surely, 2^640267070 is an apocalyptic number.

640267070 is a deficient number, since it is larger than the sum of its proper divisors (542703586).

640267070 is a wasteful number, since it uses less digits than its factorization.

640267070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 640267070 is about 25303.4991651352. The cubic root of 640267070 is about 861.8937311910.

The spelling of 640267070 in words is "six hundred forty million, two hundred sixty-seven thousand, seventy".