646672763 has 24 divisors (see below), whose sum is σ = 726339600. Its totient is φ = 575182080.

The previous prime is 646672759. The next prime is 646672777. The reversal of 646672763 is 367276646.

It is not a de Polignac number, because 646672763 - 2² = 646672759 is a prime.

It is a Duffinian number.

Its product of digits (1524096) is a multiple of the sum of its prime divisors (672).

It is not an unprimeable number, because it can be changed into a prime (646672753) 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 23 ways as a sum of consecutive naturals, for example, 1580903 + ... + 1581311.

It is an arithmetic number, because the mean of its divisors is an integer number (30264150).

Almost surely, 2^646672763 is an apocalyptic number.

646672763 is a deficient number, since it is larger than the sum of its proper divisors (79666837).

646672763 is a wasteful number, since it uses less digits than its factorization.

646672763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683 (or 672 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 47.

The square root of 646672763 is about 25429.7613634104. The cubic root of 646672763 is about 864.7585337343.

The spelling of 646672763 in words is "six hundred forty-six million, six hundred seventy-two thousand, seven hundred sixty-three".