646849772 has 6 divisors (see below), whose sum is σ = 1131987108. Its totient is φ = 323424884.

The previous prime is 646849771. The next prime is 646849781. The reversal of 646849772 is 277948646.

It is not an unprimeable number, because it can be changed into a prime (646849771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80856218 + ... + 80856225.

It is an arithmetic number, because the mean of its divisors is an integer number (188664518).

Almost surely, 2^646849772 is an apocalyptic number.

It is an amenable number.

646849772 is a deficient number, since it is larger than the sum of its proper divisors (485137336).

646849772 is a wasteful number, since it uses less digits than its factorization.

646849772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161712447 (or 161712445 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 53.

The square root of 646849772 is about 25433.2414764615. The cubic root of 646849772 is about 864.8374278767.

The spelling of 646849772 in words is "six hundred forty-six million, eight hundred forty-nine thousand, seven hundred seventy-two".