649801064 has 64 divisors (see below), whose sum is σ = 1481457600. Its totient is φ = 263347200.

The previous prime is 649801039. The next prime is 649801093. The reversal of 649801064 is 460108946.

It is a Harshad number since it is a multiple of its sum of digits (38).

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, 16994 + ... + 39854.

It is an arithmetic number, because the mean of its divisors is an integer number (23147775).

Almost surely, 2^649801064 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 649801064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740728800).

649801064 is an abundant number, since it is smaller than the sum of its proper divisors (831656536).

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

649801064 is a wasteful number, since it uses less digits than its factorization.

649801064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22914 (or 22910 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 649801064 is about 25491.1958134568. The cubic root of 649801064 is about 866.1507239429.

The spelling of 649801064 in words is "six hundred forty-nine million, eight hundred one thousand, sixty-four".