640025464 has 32 divisors (see below), whose sum is σ = 1293556320. Its totient is φ = 295122816.

The previous prime is 640025443. The next prime is 640025467. The reversal of 640025464 is 464520046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640025467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148362 + ... + 152614.

It is an arithmetic number, because the mean of its divisors is an integer number (40423635).

Almost surely, 2^640025464 is an apocalyptic number.

It is an amenable number.

640025464 is an abundant number, since it is smaller than the sum of its proper divisors (653530856).

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

640025464 is a wasteful number, since it uses less digits than its factorization.

640025464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719 (or 5715 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 640025464 is about 25298.7245528307. The cubic root of 640025464 is about 861.7853051372.

The spelling of 640025464 in words is "six hundred forty million, twenty-five thousand, four hundred sixty-four".