721646082 has 12 divisors (see below), whose sum is σ = 1563566550. Its totient is φ = 240548688.

The previous prime is 721646077. The next prime is 721646083. The reversal of 721646082 is 280646127.

721646082 is a `hidden beast` number, since 7 + 2 + 1 + 646 + 0 + 8 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 652240521 + 69405561 = 25539^2 + 8331^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (721646083) 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 5 ways as a sum of consecutive naturals, for example, 20045707 + ... + 20045742.

Almost surely, 2^721646082 is an apocalyptic number.

721646082 is an abundant number, since it is smaller than the sum of its proper divisors (841920468).

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

721646082 is a wasteful number, since it uses less digits than its factorization.

721646082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40091457 (or 40091454 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 721646082 is about 26863.4711457771. The cubic root of 721646082 is about 896.9634627534.

The spelling of 721646082 in words is "seven hundred twenty-one million, six hundred forty-six thousand, eighty-two".