640419800 has 24 divisors (see below), whose sum is σ = 1488976500. Its totient is φ = 256167840.

The previous prime is 640419781. The next prime is 640419803. The reversal of 640419800 is 8914046.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640419803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1600850 + ... + 1601249.

Almost surely, 2^640419800 is an apocalyptic number.

It is an amenable number.

640419800 is an abundant number, since it is smaller than the sum of its proper divisors (848556700).

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

640419800 is a wasteful number, since it uses less digits than its factorization.

640419800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202115 (or 3202106 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 640419800 is about 25306.5169472213. The cubic root of 640419800 is about 861.9622580971.

The spelling of 640419800 in words is "six hundred forty million, four hundred nineteen thousand, eight hundred".