1639249928 has 32 divisors (see below), whose sum is σ = 3376036800. Its totient is φ = 742724928.

The previous prime is 1639249901. The next prime is 1639249949. The reversal of 1639249928 is 8299429361.

It is a self number, because there is not a number n which added to its sum of digits gives 1639249928.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 230951 + ... + 237942.

It is an arithmetic number, because the mean of its divisors is an integer number (105501150).

Almost surely, 2^1639249928 is an apocalyptic number.

It is an amenable number.

1639249928 is an abundant number, since it is smaller than the sum of its proper divisors (1736786872).

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

1639249928 is a wasteful number, since it uses less digits than its factorization.

1639249928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468941 (or 468937 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 1639249928 is about 40487.6515495774. The cubic root of 1639249928 is about 1179.0938959871.

The spelling of 1639249928 in words is "one billion, six hundred thirty-nine million, two hundred forty-nine thousand, nine hundred twenty-eight".