649928160 has 432 divisors, whose sum is σ = 2639643552. Its totient is φ = 145152000.

The previous prime is 649928159. The next prime is 649928177. The reversal of 649928160 is 61829946.

It is a happy number.

It is a super-2 number, since 2×649928160² = 844813226321971200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4304085 + ... + 4304235.

It is an arithmetic number, because the mean of its divisors is an integer number (6110286).

Almost surely, 2^649928160 is an apocalyptic number.

649928160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649928160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319821776).

649928160 is an abundant number, since it is smaller than the sum of its proper divisors (1989715392).

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

649928160 is a wasteful number, since it uses less digits than its factorization.

649928160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 649928160 is about 25493.6886307180. The cubic root of 649928160 is about 866.2071910280.

The spelling of 649928160 in words is "six hundred forty-nine million, nine hundred twenty-eight thousand, one hundred sixty".