649697544 has 64 divisors (see below), whose sum is σ = 1843142400. Its totient is φ = 211954752.

The previous prime is 649697539. The next prime is 649697567. The reversal of 649697544 is 445796946.

It is a happy number.

649697544 is a `hidden beast` number, since 6 + 4 + 9 + 6 + 97 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21847 + ... + 42150.

It is an arithmetic number, because the mean of its divisors is an integer number (28799100).

Almost surely, 2^649697544 is an apocalyptic number.

It is an amenable number.

649697544 is an abundant number, since it is smaller than the sum of its proper divisors (1193444856).

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

649697544 is a wasteful number, since it uses less digits than its factorization.

649697544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64059 (or 64049 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 649697544 is about 25489.1652276021. The cubic root of 649697544 is about 866.1047259240.

The spelling of 649697544 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, five hundred forty-four".