649555800 has 48 divisors (see below), whose sum is σ = 2013624840. Its totient is φ = 173214720.

The previous prime is 649555799. The next prime is 649555843. The reversal of 649555800 is 8555946.

It is a super-3 number, since 3×649555800³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540697 + ... + 541896.

Almost surely, 2^649555800 is an apocalyptic number.

649555800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649555800 is an abundant number, since it is smaller than the sum of its proper divisors (1364069040).

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

649555800 is a wasteful number, since it uses less digits than its factorization.

649555800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082612 (or 1082603 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 649555800 is about 25486.3846004097. The cubic root of 649555800 is about 866.0417355483.

The spelling of 649555800 in words is "six hundred forty-nine million, five hundred fifty-five thousand, eight hundred".