64172389 has 8 divisors (see below), whose sum is σ = 66519000. Its totient is φ = 61834752.

The previous prime is 64172377. The next prime is 64172413. The reversal of 64172389 is 98327146.

It can be written as a sum of positive squares in 4 ways, for example, as 7049025 + 57123364 = 2655^2 + 7558^2 .

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 64172389 - 2⁷ = 64172261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64172309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14557 + ... + 18445.

It is an arithmetic number, because the mean of its divisors is an integer number (8314875).

Almost surely, 2^64172389 is an apocalyptic number.

It is an amenable number.

64172389 is a deficient number, since it is larger than the sum of its proper divisors (2346611).

64172389 is a wasteful number, since it uses less digits than its factorization.

64172389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487.

The product of its digits is 72576, while the sum is 40.

The square root of 64172389 is about 8010.7670668919. The cubic root of 64172389 is about 400.3588217711.

The spelling of 64172389 in words is "sixty-four million, one hundred seventy-two thousand, three hundred eighty-nine".