647385279 has 16 divisors (see below), whose sum is σ = 918070272. Its totient is φ = 404373888.

The previous prime is 647385269. The next prime is 647385311. The reversal of 647385279 is 972583746.

It is not a de Polignac number, because 647385279 - 2⁵ = 647385247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647385269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17089 + ... + 39834.

It is an arithmetic number, because the mean of its divisors is an integer number (57379392).

Almost surely, 2^647385279 is an apocalyptic number.

647385279 is a deficient number, since it is larger than the sum of its proper divisors (270684993).

647385279 is a wasteful number, since it uses less digits than its factorization.

647385279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57166.

The product of its digits is 2540160, while the sum is 51.

The square root of 647385279 is about 25443.7669970466. The cubic root of 647385279 is about 865.0760194697.

The spelling of 647385279 in words is "six hundred forty-seven million, three hundred eighty-five thousand, two hundred seventy-nine".