647336493 has 6 divisors (see below), whose sum is σ = 935041614. Its totient is φ = 431557656.

The previous prime is 647336477. The next prime is 647336527. The reversal of 647336493 is 394633746.

647336493 is a `hidden beast` number, since 64 + 73 + 36 + 493 = 666.

It can be written as a sum of positive squares in only one way, i.e., 642014244 + 5322249 = 25338^2 + 2307^2 .

It is not a de Polignac number, because 647336493 - 2⁴ = 647336477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647336093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35963130 + ... + 35963147.

It is an arithmetic number, because the mean of its divisors is an integer number (155840269).

Almost surely, 2^647336493 is an apocalyptic number.

It is an amenable number.

647336493 is a deficient number, since it is larger than the sum of its proper divisors (287705121).

647336493 is a wasteful number, since it uses less digits than its factorization.

647336493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71926283 (or 71926280 counting only the distinct ones).

The product of its digits is 979776, while the sum is 45.

The square root of 647336493 is about 25442.8082766034. The cubic root of 647336493 is about 865.0542886394.

The spelling of 647336493 in words is "six hundred forty-seven million, three hundred thirty-six thousand, four hundred ninety-three".