649619790 has 16 divisors (see below), whose sum is σ = 1559087568. Its totient is φ = 173231936.

The previous prime is 649619777. The next prime is 649619809. The reversal of 649619790 is 97916946.

649619790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 10826967 + ... + 10827026.

It is an arithmetic number, because the mean of its divisors is an integer number (97442973).

Almost surely, 2^649619790 is an apocalyptic number.

649619790 is an abundant number, since it is smaller than the sum of its proper divisors (909467778).

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

649619790 is a wasteful number, since it uses less digits than its factorization.

649619790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21654003.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 649619790 is about 25487.6399456678. The cubic root of 649619790 is about 866.0701735419.

The spelling of 649619790 in words is "six hundred forty-nine million, six hundred nineteen thousand, seven hundred ninety".