640703004 has 24 divisors (see below), whose sum is σ = 1582913808. Its totient is φ = 201004800.

The previous prime is 640702991. The next prime is 640703029. The reversal of 640703004 is 400307046.

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, 1570147 + ... + 1570554.

It is an arithmetic number, because the mean of its divisors is an integer number (65954742).

Almost surely, 2^640703004 is an apocalyptic number.

It is an amenable number.

640703004 is an abundant number, since it is smaller than the sum of its proper divisors (942210804).

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

640703004 is a wasteful number, since it uses less digits than its factorization.

640703004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140725 (or 3140723 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 640703004 is about 25312.1118044307. Note that the first 3 decimals coincide. The cubic root of 640703004 is about 862.0892972594.

The spelling of 640703004 in words is "six hundred forty million, seven hundred three thousand, four".