646724799 has 48 divisors (see below), whose sum is σ = 1085280768. Its totient is φ = 363496896.

The previous prime is 646724797. The next prime is 646724809. The reversal of 646724799 is 997427646.

It is a happy number.

It is not a de Polignac number, because 646724799 - 2¹ = 646724797 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646724791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1327734 + ... + 1328220.

It is an arithmetic number, because the mean of its divisors is an integer number (22610016).

Almost surely, 2^646724799 is an apocalyptic number.

646724799 is a deficient number, since it is larger than the sum of its proper divisors (438555969).

646724799 is a wasteful number, since it uses less digits than its factorization.

646724799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 801 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 646724799 is about 25430.7844747267. The cubic root of 646724799 is about 864.7817280353.

The spelling of 646724799 in words is "six hundred forty-six million, seven hundred twenty-four thousand, seven hundred ninety-nine".