646831436 has 24 divisors (see below), whose sum is σ = 1209161520. Its totient is φ = 301693952.

The previous prime is 646831417. The next prime is 646831463. The reversal of 646831436 is 634138646.

It is a junction number, because it is equal to n+sod(n) for n = 646831393 and 646831402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34406 + ... + 49773.

It is an arithmetic number, because the mean of its divisors is an integer number (50381730).

Almost surely, 2^646831436 is an apocalyptic number.

It is an amenable number.

646831436 is a deficient number, since it is larger than the sum of its proper divisors (562330084).

646831436 is a wasteful number, since it uses less digits than its factorization.

646831436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84313 (or 84311 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The square root of 646831436 is about 25432.8810007832. The cubic root of 646831436 is about 864.8292560623.

The spelling of 646831436 in words is "six hundred forty-six million, eight hundred thirty-one thousand, four hundred thirty-six".