646974099 has 6 divisors (see below), whose sum is σ = 934518156. Its totient is φ = 431316060.

The previous prime is 646974091. The next prime is 646974101. The reversal of 646974099 is 990479646.

It is not a de Polignac number, because 646974099 - 2³ = 646974091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646974091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35942997 + ... + 35943014.

It is an arithmetic number, because the mean of its divisors is an integer number (155753026).

Almost surely, 2^646974099 is an apocalyptic number.

646974099 is a deficient number, since it is larger than the sum of its proper divisors (287544057).

646974099 is a wasteful number, since it uses less digits than its factorization.

646974099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71886017 (or 71886014 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 646974099 is about 25435.6855421669. The cubic root of 646974099 is about 864.8928326809.

The spelling of 646974099 in words is "six hundred forty-six million, nine hundred seventy-four thousand, ninety-nine".