640369230 has 32 divisors (see below), whose sum is σ = 1538638848. Its totient is φ = 170570400.

The previous prime is 640369229. The next prime is 640369237. The reversal of 640369230 is 32963046.

It is a junction number, because it is equal to n+sod(n) for n = 640369191 and 640369200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640369237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15615 + ... + 39045.

It is an arithmetic number, because the mean of its divisors is an integer number (48082464).

Almost surely, 2^640369230 is an apocalyptic number.

640369230 is an abundant number, since it is smaller than the sum of its proper divisors (898269618).

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

640369230 is a wasteful number, since it uses less digits than its factorization.

640369230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24352.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 640369230 is about 25305.5177777496. The cubic root of 640369230 is about 861.9395695529.

The spelling of 640369230 in words is "six hundred forty million, three hundred sixty-nine thousand, two hundred thirty".