640507154 has 8 divisors (see below), whose sum is σ = 1098012288. Its totient is φ = 274503060.

The previous prime is 640507129. The next prime is 640507163. The reversal of 640507154 is 451705046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 640507154.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22875242 + ... + 22875269.

It is an arithmetic number, because the mean of its divisors is an integer number (137251536).

Almost surely, 2^640507154 is an apocalyptic number.

640507154 is a deficient number, since it is larger than the sum of its proper divisors (457505134).

640507154 is a wasteful number, since it uses less digits than its factorization.

640507154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45750520.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 640507154 is about 25308.2428074333. The cubic root of 640507154 is about 862.0014471976.

The spelling of 640507154 in words is "six hundred forty million, five hundred seven thousand, one hundred fifty-four".