646914464 has 96 divisors (see below), whose sum is σ = 1573084800. Its totient is φ = 260865024.

The previous prime is 646914461. The next prime is 646914467. The reversal of 646914464 is 464419646.

It is an interprime number because it is at equal distance from previous prime (646914461) and next prime (646914467).

It is not an unprimeable number, because it can be changed into a prime (646914461) 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, 184859 + ... + 188325.

It is an arithmetic number, because the mean of its divisors is an integer number (16386300).

Almost surely, 2^646914464 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 646914464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786542400).

646914464 is an abundant number, since it is smaller than the sum of its proper divisors (926170336).

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

646914464 is a wasteful number, since it uses less digits than its factorization.

646914464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3515 (or 3493 counting only the distinct ones).

The product of its digits is 497664, while the sum is 44.

The square root of 646914464 is about 25434.5132448018. The cubic root of 646914464 is about 864.8662579597.

The spelling of 646914464 in words is "six hundred forty-six million, nine hundred fourteen thousand, four hundred sixty-four".