640460000 has 120 divisors (see below), whose sum is σ = 1628028864. Its totient is φ = 247680000.

The previous prime is 640459979. The next prime is 640460059. The reversal of 640460000 is 64046.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 619484 + ... + 620516.

Almost surely, 2^640460000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640460000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814014432).

640460000 is an abundant number, since it is smaller than the sum of its proper divisors (987568864).

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

640460000 is a wasteful number, since it uses less digits than its factorization.

640460000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 640460000 is about 25307.3111965693. The cubic root of 640460000 is about 861.9802932243.

Multiplying 640460000 by its reverse (64046), we get a square (41018901160000 = 6404600²).

640460000 divided by its reverse (64046) gives a 4-th power (10000 = 10⁴).

The spelling of 640460000 in words is "six hundred forty million, four hundred sixty thousand".