640200455 has 8 divisors (see below), whose sum is σ = 789004032. Its totient is φ = 498318048.

The previous prime is 640200427. The next prime is 640200479. The reversal of 640200455 is 554002046.

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

It is a cyclic number.

It is not a de Polignac number, because 640200455 - 2⁶ = 640200391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1730087 + ... + 1730456.

It is an arithmetic number, because the mean of its divisors is an integer number (98625504).

Almost surely, 2^640200455 is an apocalyptic number.

640200455 is a deficient number, since it is larger than the sum of its proper divisors (148803577).

640200455 is a wasteful number, since it uses less digits than its factorization.

640200455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460585.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 640200455 is about 25302.1828109750. The cubic root of 640200455 is about 861.8638389555.

The spelling of 640200455 in words is "six hundred forty million, two hundred thousand, four hundred fifty-five".