647969127 has 64 divisors (see below), whose sum is σ = 1036385280. Its totient is φ = 356235264.

The previous prime is 647969117. The next prime is 647969137. The reversal of 647969127 is 721969746.

It is an interprime number because it is at equal distance from previous prime (647969117) and next prime (647969137).

It is not a de Polignac number, because 647969127 - 2¹⁴ = 647952743 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 647969127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647969117) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1287958 + ... + 1288460.

It is an arithmetic number, because the mean of its divisors is an integer number (16193520).

Almost surely, 2^647969127 is an apocalyptic number.

647969127 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

647969127 is a deficient number, since it is larger than the sum of its proper divisors (388416153).

647969127 is a wasteful number, since it uses less digits than its factorization.

647969127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632.

The product of its digits is 1143072, while the sum is 51.

The square root of 647969127 is about 25455.2377125023. The cubic root of 647969127 is about 865.3359991974.

The spelling of 647969127 in words is "six hundred forty-seven million, nine hundred sixty-nine thousand, one hundred twenty-seven".