647672637 has 4 divisors (see below), whose sum is σ = 863563520. Its totient is φ = 431781756.

The previous prime is 647672633. The next prime is 647672653. The reversal of 647672637 is 736276746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647672637 - 2² = 647672633 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647672633) 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 3 ways as a sum of consecutive naturals, for example, 107945437 + ... + 107945442.

It is an arithmetic number, because the mean of its divisors is an integer number (215890880).

Almost surely, 2^647672637 is an apocalyptic number.

It is an amenable number.

647672637 is a deficient number, since it is larger than the sum of its proper divisors (215890883).

647672637 is a wasteful number, since it uses less digits than its factorization.

647672637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215890882.

The product of its digits is 1778112, while the sum is 48.

The square root of 647672637 is about 25449.4132938266. The cubic root of 647672637 is about 865.2039956798.

The spelling of 647672637 in words is "six hundred forty-seven million, six hundred seventy-two thousand, six hundred thirty-seven".