172678013 has 4 divisors (see below), whose sum is σ = 173821728. Its totient is φ = 171534300.

The previous prime is 172677979. The next prime is 172678021. The reversal of 172678013 is 310876271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310876271 = 19 ⋅16361909.

It is a cyclic number.

It is not a de Polignac number, because 172678013 - 2⁶ = 172677949 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 (172678313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571631 + ... + 571932.

It is an arithmetic number, because the mean of its divisors is an integer number (43455432).

Almost surely, 2^172678013 is an apocalyptic number.

It is an amenable number.

172678013 is a deficient number, since it is larger than the sum of its proper divisors (1143715).

172678013 is a wasteful number, since it uses less digits than its factorization.

172678013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143714.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 172678013 is about 13140.7006282009. The cubic root of 172678013 is about 556.8595612401.

The spelling of 172678013 in words is "one hundred seventy-two million, six hundred seventy-eight thousand, thirteen".