64672171 has 4 divisors (see below), whose sum is σ = 64688472. Its totient is φ = 64655872.

The previous prime is 64672151. The next prime is 64672183. The reversal of 64672171 is 17127646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64672171 - 2¹⁵ = 64639403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64672151) 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, 2091 + ... + 11563.

It is an arithmetic number, because the mean of its divisors is an integer number (16172118).

Almost surely, 2^64672171 is an apocalyptic number.

64672171 is a deficient number, since it is larger than the sum of its proper divisors (16301).

64672171 is an equidigital number, since it uses as much as digits as its factorization.

64672171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16300.

The product of its digits is 14112, while the sum is 34.

The square root of 64672171 is about 8041.9009568634. The cubic root of 64672171 is about 401.3954821623.

The spelling of 64672171 in words is "sixty-four million, six hundred seventy-two thousand, one hundred seventy-one".