646426632 has 64 divisors (see below), whose sum is σ = 1766361600. Its totient is φ = 196254720.

The previous prime is 646426631. The next prime is 646426633. The reversal of 646426632 is 236624646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (646426631) and next prime (646426633).

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

It is not an unprimeable number, because it can be changed into a prime (646426631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12907 + ... + 38202.

It is an arithmetic number, because the mean of its divisors is an integer number (27599400).

Almost surely, 2^646426632 is an apocalyptic number.

646426632 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

646426632 is an abundant number, since it is smaller than the sum of its proper divisors (1119934968).

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

646426632 is a wasteful number, since it uses less digits than its factorization.

646426632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51166 (or 51162 counting only the distinct ones).

The product of its digits is 248832, while the sum is 39.

The square root of 646426632 is about 25424.9214748050. The cubic root of 646426632 is about 864.6488075049.

The spelling of 646426632 in words is "six hundred forty-six million, four hundred twenty-six thousand, six hundred thirty-two".