640214970 has 32 divisors (see below), whose sum is σ = 1539839808. Its totient is φ = 170354688.

The previous prime is 640214963. The next prime is 640214977. The reversal of 640214970 is 79412046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (640214963) and next prime (640214977).

It is not an unprimeable number, because it can be changed into a prime (640214977) 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, 8839 + ... + 36858.

It is an arithmetic number, because the mean of its divisors is an integer number (48119994).

Almost surely, 2^640214970 is an apocalyptic number.

640214970 is an abundant number, since it is smaller than the sum of its proper divisors (899624838).

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

640214970 is a wasteful number, since it uses less digits than its factorization.

640214970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46174.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 640214970 is about 25302.4696423096. The cubic root of 640214970 is about 861.8703524670.

The spelling of 640214970 in words is "six hundred forty million, two hundred fourteen thousand, nine hundred seventy".