649472990 has 16 divisors (see below), whose sum is σ = 1170391248. Its totient is φ = 259491456.

The previous prime is 649472969. The next prime is 649473001. The reversal of 649472990 is 99274946.

It is a Curzon number.

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, 27947 + ... + 45606.

It is an arithmetic number, because the mean of its divisors is an integer number (73149453).

Almost surely, 2^649472990 is an apocalyptic number.

649472990 is a deficient number, since it is larger than the sum of its proper divisors (520918258).

649472990 is a wasteful number, since it uses less digits than its factorization.

649472990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74443.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 649472990 is about 25484.7599557069. The cubic root of 649472990 is about 866.0049309279.

The spelling of 649472990 in words is "six hundred forty-nine million, four hundred seventy-two thousand, nine hundred ninety".