646830431 has 12 divisors (see below), whose sum is σ = 705952512. Its totient is φ = 592353216.

The previous prime is 646830427. The next prime is 646830439. The reversal of 646830431 is 134038646.

It is not a de Polignac number, because 646830431 - 2² = 646830427 is a prime.

It is a super-2 number, since 2×646830431² = 836779212935291522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646830391 and 646830400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646830439) 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, 6395 + ... + 36531.

It is an arithmetic number, because the mean of its divisors is an integer number (58829376).

Almost surely, 2^646830431 is an apocalyptic number.

646830431 is a deficient number, since it is larger than the sum of its proper divisors (59122081).

646830431 is a wasteful number, since it uses less digits than its factorization.

646830431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30290 (or 30277 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 646830431 is about 25432.8612428881. The cubic root of 646830431 is about 864.8288081590.

The spelling of 646830431 in words is "six hundred forty-six million, eight hundred thirty thousand, four hundred thirty-one".