649641900 has 72 divisors (see below), whose sum is σ = 1961374464. Its totient is φ = 165704000.

The previous prime is 649641899. The next prime is 649641907. The reversal of 649641900 is 9146946.

It is a super-2 number, since 2×649641900² = 844069196471220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649641907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40176 + ... + 53975.

It is an arithmetic number, because the mean of its divisors is an integer number (27241312).

Almost surely, 2^649641900 is an apocalyptic number.

649641900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649641900 is an abundant number, since it is smaller than the sum of its proper divisors (1311732564).

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

649641900 is a wasteful number, since it uses less digits than its factorization.

649641900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94191 (or 94184 counting only the distinct ones).

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

The square root of 649641900 is about 25488.0736816261. The cubic root of 649641900 is about 866.0799990811.

The spelling of 649641900 in words is "six hundred forty-nine million, six hundred forty-one thousand, nine hundred".