649457844 has 48 divisors (see below), whose sum is σ = 1768747008. Its totient is φ = 181610208.

The previous prime is 649457839. The next prime is 649457869. The reversal of 649457844 is 448754946.

It is a happy number.

It is a super-2 number, since 2×649457844² = 843590982266256672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78304 + ... + 86199.

It is an arithmetic number, because the mean of its divisors is an integer number (36848896).

Almost surely, 2^649457844 is an apocalyptic number.

It is an amenable number.

649457844 is an abundant number, since it is smaller than the sum of its proper divisors (1119289164).

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

649457844 is a wasteful number, since it uses less digits than its factorization.

649457844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164564 (or 164562 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 51.

The square root of 649457844 is about 25484.4627959861. The cubic root of 649457844 is about 865.9981990017.

The spelling of 649457844 in words is "six hundred forty-nine million, four hundred fifty-seven thousand, eight hundred forty-four".