640341064 has 32 divisors (see below), whose sum is σ = 1310760000. Its totient is φ = 290848320.

The previous prime is 640341049. The next prime is 640341103. The reversal of 640341064 is 460143046.

It is a happy 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, 231562 + ... + 234310.

It is an arithmetic number, because the mean of its divisors is an integer number (40961250).

Almost surely, 2^640341064 is an apocalyptic number.

It is an amenable number.

640341064 is an abundant number, since it is smaller than the sum of its proper divisors (670418936).

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

640341064 is a wasteful number, since it uses less digits than its factorization.

640341064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413 (or 5409 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 640341064 is about 25304.9612526872. The cubic root of 640341064 is about 861.9269321844.

The spelling of 640341064 in words is "six hundred forty million, three hundred forty-one thousand, sixty-four".