649445784 has 128 divisors (see below), whose sum is σ = 1828915200. Its totient is φ = 190817280.

The previous prime is 649445773. The next prime is 649445791. The reversal of 649445784 is 487544946.

It is a happy number.

Its product of digits (3870720) is a multiple of the sum of its prime factors (945).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 802372 + ... + 803180.

It is an arithmetic number, because the mean of its divisors is an integer number (14288400).

Almost surely, 2^649445784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649445784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914457600).

649445784 is an abundant number, since it is smaller than the sum of its proper divisors (1179469416).

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

649445784 is a wasteful number, since it uses less digits than its factorization.

649445784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 941 counting only the distinct ones).

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

The square root of 649445784 is about 25484.2261801295. The cubic root of 649445784 is about 865.9928386318.

The spelling of 649445784 in words is "six hundred forty-nine million, four hundred forty-five thousand, seven hundred eighty-four".