647640699 has 16 divisors (see below), whose sum is σ = 882800640. Its totient is φ = 422198240.

The previous prime is 647640677. The next prime is 647640701. The reversal of 647640699 is 996046746.

It is a cyclic number.

It is not a de Polignac number, because 647640699 - 2⁷ = 647640571 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (647640649) 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 15 ways as a sum of consecutive naturals, for example, 24229 + ... + 43385.

It is an arithmetic number, because the mean of its divisors is an integer number (55175040).

Almost surely, 2^647640699 is an apocalyptic number.

647640699 is a deficient number, since it is larger than the sum of its proper divisors (235159941).

647640699 is a wasteful number, since it uses less digits than its factorization.

647640699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19410.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 647640699 is about 25448.7858060065. The cubic root of 647640699 is about 865.1897738143.

The spelling of 647640699 in words is "six hundred forty-seven million, six hundred forty thousand, six hundred ninety-nine".