649662172 has 12 divisors (see below), whose sum is σ = 1137255336. Its totient is φ = 324732080.

The previous prime is 649662121. The next prime is 649662203. The reversal of 649662172 is 271266946.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8854 + ... + 37117.

It is an arithmetic number, because the mean of its divisors is an integer number (94771278).

Almost surely, 2^649662172 is an apocalyptic number.

It is an amenable number.

649662172 is a deficient number, since it is larger than the sum of its proper divisors (487593164).

649662172 is a wasteful number, since it uses less digits than its factorization.

649662172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49508 (or 49506 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 649662172 is about 25488.4713547125. The cubic root of 649662172 is about 866.0890076293.

The spelling of 649662172 in words is "six hundred forty-nine million, six hundred sixty-two thousand, one hundred seventy-two".