649957770 has 320 divisors, whose sum is σ = 2310840576. Its totient is φ = 126904320.

The previous prime is 649957769. The next prime is 649957793. The reversal of 649957770 is 77759946.

It is a happy number.

649957770 is a `hidden beast` number, since 64 + 9 + 9 + 577 + 7 + 0 = 666.

649957770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1059984 + ... + 1060596.

Almost surely, 2^649957770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649957770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1155420288).

649957770 is an abundant number, since it is smaller than the sum of its proper divisors (1660882806).

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

649957770 is a wasteful number, since it uses less digits than its factorization.

649957770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The square root of 649957770 is about 25494.2693560729. The cubic root of 649957770 is about 866.2203453052.

The spelling of 649957770 in words is "six hundred forty-nine million, nine hundred fifty-seven thousand, seven hundred seventy".