646633692 has 72 divisors (see below), whose sum is σ = 1794841776. Its totient is φ = 202860288.

The previous prime is 646633679. The next prime is 646633693. The reversal of 646633692 is 296336646.

It is a happy number.

646633692 is a `hidden beast` number, since 6 + 4 + 6 + 633 + 6 + 9 + 2 = 666.

646633692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646633693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3043 + ... + 36090.

It is an arithmetic number, because the mean of its divisors is an integer number (24928358).

Almost surely, 2^646633692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646633692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897420888).

646633692 is an abundant number, since it is smaller than the sum of its proper divisors (1148208084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646633692 is a wasteful number, since it uses less digits than its factorization.

646633692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39169 (or 39155 counting only the distinct ones).

The product of its digits is 839808, while the sum is 45.

The square root of 646633692 is about 25428.9931377552. The cubic root of 646633692 is about 864.7411175783.

The spelling of 646633692 in words is "six hundred forty-six million, six hundred thirty-three thousand, six hundred ninety-two".