647872707 has 4 divisors (see below), whose sum is σ = 863830280. Its totient is φ = 431915136.

The previous prime is 647872699. The next prime is 647872723. The reversal of 647872707 is 707278746.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 647872707 - 2³ = 647872699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647872777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107978782 + ... + 107978787.

It is an arithmetic number, because the mean of its divisors is an integer number (215957570).

Almost surely, 2^647872707 is an apocalyptic number.

647872707 is a deficient number, since it is larger than the sum of its proper divisors (215957573).

647872707 is a wasteful number, since it uses less digits than its factorization.

647872707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215957572.

The product of its (nonzero) digits is 921984, while the sum is 48.

The square root of 647872707 is about 25453.3437292628. The cubic root of 647872707 is about 865.2930754260.

The spelling of 647872707 in words is "six hundred forty-seven million, eight hundred seventy-two thousand, seven hundred seven".