646830432 has 72 divisors (see below), whose sum is σ = 1884322440. Its totient is φ = 210347520.

The previous prime is 646830427. The next prime is 646830439. The reversal of 646830432 is 234038646.

It is a happy number.

646830432 is a `hidden beast` number, since 646 + 8 + 3 + 0 + 4 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×646830432² = 836779215522613248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 15582 + ... + 39197.

It is an arithmetic number, because the mean of its divisors is an integer number (26171145).

Almost surely, 2^646830432 is an apocalyptic number.

It is an amenable number.

646830432 is an abundant number, since it is smaller than the sum of its proper divisors (1237492008).

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

646830432 is a wasteful number, since it uses less digits than its factorization.

646830432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54836 (or 54825 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 646830432 is about 25432.8612625477. The cubic root of 646830432 is about 864.8288086047.

The spelling of 646830432 in words is "six hundred forty-six million, eight hundred thirty thousand, four hundred thirty-two".