640070332 has 24 divisors (see below), whose sum is σ = 1293833520. Its totient is φ = 273826560.

The previous prime is 640070273. The next prime is 640070357. The reversal of 640070332 is 233070046.

640070332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 640070297 and 640070306.

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, 427107 + ... + 428602.

It is an arithmetic number, because the mean of its divisors is an integer number (53909730).

Almost surely, 2^640070332 is an apocalyptic number.

It is an amenable number.

640070332 is an abundant number, since it is smaller than the sum of its proper divisors (653763188).

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

640070332 is a wasteful number, since it uses less digits than its factorization.

640070332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855741 (or 855739 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 640070332 is about 25299.6113013619. The cubic root of 640070332 is about 861.8054427107.

The spelling of 640070332 in words is "six hundred forty million, seventy thousand, three hundred thirty-two".