640417707 has 12 divisors (see below), whose sum is σ = 925679664. Its totient is φ = 426653520.

The previous prime is 640417703. The next prime is 640417717. The reversal of 640417707 is 707714046.

640417707 is a `hidden beast` number, since 640 + 4 + 1 + 7 + 7 + 0 + 7 = 666.

It is not a de Polignac number, because 640417707 - 2² = 640417703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640417703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9948 + ... + 37145.

It is an arithmetic number, because the mean of its divisors is an integer number (77139972).

Almost surely, 2^640417707 is an apocalyptic number.

640417707 is a deficient number, since it is larger than the sum of its proper divisors (285261957).

640417707 is a wasteful number, since it uses less digits than its factorization.

640417707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48610 (or 48607 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 640417707 is about 25306.4755942032. The cubic root of 640417707 is about 861.9613190833.

The spelling of 640417707 in words is "six hundred forty million, four hundred seventeen thousand, seven hundred seven".