647828747 has 8 divisors (see below), whose sum is σ = 654812400. Its totient is φ = 640864224.

The previous prime is 647828743. The next prime is 647828761. The reversal of 647828747 is 747828746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647828747 - 2² = 647828743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647828743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69404 + ... + 78182.

It is an arithmetic number, because the mean of its divisors is an integer number (81851550).

Almost surely, 2^647828747 is an apocalyptic number.

647828747 is a deficient number, since it is larger than the sum of its proper divisors (6983653).

647828747 is a wasteful number, since it uses less digits than its factorization.

647828747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9565.

The product of its digits is 4214784, while the sum is 53.

The square root of 647828747 is about 25452.4801738455. The cubic root of 647828747 is about 865.2735041206.

Subtracting 647828747 from its reverse (747828746), we obtain a palindrome (99999999).

The spelling of 647828747 in words is "six hundred forty-seven million, eight hundred twenty-eight thousand, seven hundred forty-seven".