646747478 has 8 divisors (see below), whose sum is σ = 1044745968. Its totient is φ = 298498824.

The previous prime is 646747459. The next prime is 646747501. The reversal of 646747478 is 874747646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12437426 + ... + 12437477.

It is an arithmetic number, because the mean of its divisors is an integer number (130593246).

Almost surely, 2^646747478 is an apocalyptic number.

646747478 is a deficient number, since it is larger than the sum of its proper divisors (397998490).

646747478 is a wasteful number, since it uses less digits than its factorization.

646747478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24874918.

The product of its digits is 6322176, while the sum is 53.

The square root of 646747478 is about 25431.2303674046. The cubic root of 646747478 is about 864.7918364852.

The spelling of 646747478 in words is "six hundred forty-six million, seven hundred forty-seven thousand, four hundred seventy-eight".