649460784 has 80 divisors (see below), whose sum is σ = 1937320448. Its totient is φ = 183638016.

The previous prime is 649460783. The next prime is 649460891. The reversal of 649460784 is 487064946.

649460784 = T₂₁₇ + T₂₁₈ + ... + T₁₅₇₄.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (649460783) 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, 22629 + ... + 42555.

Almost surely, 2^649460784 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 649460784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968660224).

649460784 is an abundant number, since it is smaller than the sum of its proper divisors (1287859664).

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

649460784 is a wasteful number, since it uses less digits than its factorization.

649460784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20042 (or 20036 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 649460784 is about 25484.5204781255. The cubic root of 649460784 is about 865.9995057485. Note that the first 3 decimals are identical.

The spelling of 649460784 in words is "six hundred forty-nine million, four hundred sixty thousand, seven hundred eighty-four".