649961400 has 96 divisors (see below), whose sum is σ = 2198073600. Its totient is φ = 157564800.

The previous prime is 649961399. The next prime is 649961437. The reversal of 649961400 is 4169946.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42640 + ... + 55839.

It is an arithmetic number, because the mean of its divisors is an integer number (22896600).

Almost surely, 2^649961400 is an apocalyptic number.

649961400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649961400 is an abundant number, since it is smaller than the sum of its proper divisors (1548112200).

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

649961400 is a wasteful number, since it uses less digits than its factorization.

649961400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98509 (or 98500 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 649961400 is about 25494.3405484433. The cubic root of 649961400 is about 866.2219579094.

The spelling of 649961400 in words is "six hundred forty-nine million, nine hundred sixty-one thousand, four hundred".