649858836 has 48 divisors (see below), whose sum is σ = 1726115328. Its totient is φ = 188364000.

The previous prime is 649858831. The next prime is 649858837. The reversal of 649858836 is 638858946.

It is a super-3 number, since 3×649858836³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649858831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103990 + ... + 110061.

It is an arithmetic number, because the mean of its divisors is an integer number (35960736).

Almost surely, 2^649858836 is an apocalyptic number.

649858836 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

649858836 is an abundant number, since it is smaller than the sum of its proper divisors (1076256492).

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

649858836 is a wasteful number, since it uses less digits than its factorization.

649858836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214092 (or 214090 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 57.

The square root of 649858836 is about 25492.3289638275. The cubic root of 649858836 is about 866.1763921971.

The spelling of 649858836 in words is "six hundred forty-nine million, eight hundred fifty-eight thousand, eight hundred thirty-six".