640953106 has 16 divisors (see below), whose sum is σ = 1015054560. Its totient is φ = 302702400.

The previous prime is 640953101. The next prime is 640953107. The reversal of 640953106 is 601359046.

It is not an unprimeable number, because it can be changed into a prime (640953101) 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, 12220 + ... + 37831.

It is an arithmetic number, because the mean of its divisors is an integer number (63440910).

Almost surely, 2^640953106 is an apocalyptic number.

640953106 is a deficient number, since it is larger than the sum of its proper divisors (374101454).

640953106 is a wasteful number, since it uses less digits than its factorization.

640953106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50409.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 640953106 is about 25317.0516845860. The cubic root of 640953106 is about 862.2014564592.

The spelling of 640953106 in words is "six hundred forty million, nine hundred fifty-three thousand, one hundred six".