640545254 has 8 divisors (see below), whose sum is σ = 960971448. Its totient is φ = 320221440.

The previous prime is 640545229. The next prime is 640545263. The reversal of 640545254 is 452545046.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7352 + ... + 36539.

It is an arithmetic number, because the mean of its divisors is an integer number (120121431).

Almost surely, 2^640545254 is an apocalyptic number.

640545254 is a deficient number, since it is larger than the sum of its proper divisors (320426194).

640545254 is a wasteful number, since it uses less digits than its factorization.

640545254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51190.

The product of its (nonzero) digits is 96000, while the sum is 35.

The square root of 640545254 is about 25308.9955154289. The cubic root of 640545254 is about 862.0185386560.

The spelling of 640545254 in words is "six hundred forty million, five hundred forty-five thousand, two hundred fifty-four".