647672155 has 8 divisors (see below), whose sum is σ = 836991792. Its totient is φ = 478280928.

The previous prime is 647672147. The next prime is 647672213. The reversal of 647672155 is 551276746.

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 647672155 - 2³ = 647672147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4982029 + ... + 4982158.

It is an arithmetic number, because the mean of its divisors is an integer number (104623974).

Almost surely, 2^647672155 is an apocalyptic number.

647672155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

647672155 is a deficient number, since it is larger than the sum of its proper divisors (189319637).

647672155 is a wasteful number, since it uses less digits than its factorization.

647672155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9964205.

The product of its digits is 352800, while the sum is 43.

The square root of 647672155 is about 25449.4038240584. The cubic root of 647672155 is about 865.2037810506.

The spelling of 647672155 in words is "six hundred forty-seven million, six hundred seventy-two thousand, one hundred fifty-five".