646132044 has 24 divisors (see below), whose sum is σ = 1511995968. Its totient is φ = 214755280.

The previous prime is 646132043. The next prime is 646132099. The reversal of 646132044 is 440231646.

It is not an unprimeable number, because it can be changed into a prime (646132043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73422 + ... + 81749.

It is an arithmetic number, because the mean of its divisors is an integer number (62999832).

Almost surely, 2^646132044 is an apocalyptic number.

It is an amenable number.

646132044 is an abundant number, since it is smaller than the sum of its proper divisors (865863924).

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

646132044 is a wasteful number, since it uses less digits than its factorization.

646132044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155525 (or 155523 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 646132044 is about 25419.1275223993. The cubic root of 646132044 is about 864.5174423182.

The spelling of 646132044 in words is "six hundred forty-six million, one hundred thirty-two thousand, forty-four".