640599654 has 16 divisors (see below), whose sum is σ = 1281552192. Its totient is φ = 213474408.

The previous prime is 640599653. The next prime is 640599667. The reversal of 640599654 is 456995046.

640599654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640599653) 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, 12877 + ... + 38039.

It is an arithmetic number, because the mean of its divisors is an integer number (80097012).

Almost surely, 2^640599654 is an apocalyptic number.

640599654 is an abundant number, since it is smaller than the sum of its proper divisors (640952538).

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

640599654 is a wasteful number, since it uses less digits than its factorization.

640599654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29411.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The square root of 640599654 is about 25310.0702093060. The cubic root of 640599654 is about 862.0429410333.

The spelling of 640599654 in words is "six hundred forty million, five hundred ninety-nine thousand, six hundred fifty-four".