646799994 has 24 divisors (see below), whose sum is σ = 1431218880. Its totient is φ = 211012488.

The previous prime is 646799987. The next prime is 646799999. The reversal of 646799994 is 499997646.

646799994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (646799999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381424 + ... + 383115.

It is an arithmetic number, because the mean of its divisors is an integer number (59634120).

Almost surely, 2^646799994 is an apocalyptic number.

646799994 is an abundant number, since it is smaller than the sum of its proper divisors (784418886).

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

646799994 is a wasteful number, since it uses less digits than its factorization.

646799994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764594 (or 764591 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 63.

The square root of 646799994 is about 25432.2628564585. The cubic root of 646799994 is about 864.8152429307.

The spelling of 646799994 in words is "six hundred forty-six million, seven hundred ninety-nine thousand, nine hundred ninety-four".