640375696 has 40 divisors (see below), whose sum is σ = 1324468800. Its totient is φ = 299053440.

The previous prime is 640375693. The next prime is 640375699. The reversal of 640375696 is 696573046.

It is an interprime number because it is at equal distance from previous prime (640375693) and next prime (640375699).

It is not an unprimeable number, because it can be changed into a prime (640375691) 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, 6750 + ... + 36418.

It is an arithmetic number, because the mean of its divisors is an integer number (33111720).

Almost surely, 2^640375696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640375696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662234400).

640375696 is an abundant number, since it is smaller than the sum of its proper divisors (684093104).

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

640375696 is a wasteful number, since it uses less digits than its factorization.

640375696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29767 (or 29761 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 640375696 is about 25305.6455361249. The cubic root of 640375696 is about 861.9424706305.

The spelling of 640375696 in words is "six hundred forty million, three hundred seventy-five thousand, six hundred ninety-six".