72860173 has 4 divisors (see below), whose sum is σ = 72885148. Its totient is φ = 72835200.

The previous prime is 72860153. The next prime is 72860233. The reversal of 72860173 is 37106827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37106827 = 113 ⋅328379.

It can be written as a sum of positive squares in 2 ways, for example, as 69522244 + 3337929 = 8338^2 + 1827^2 .

It is a cyclic number.

It is not a de Polignac number, because 72860173 - 2¹⁷ = 72729101 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 (72860153) 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, 7428 + ... + 14173.

It is an arithmetic number, because the mean of its divisors is an integer number (18221287).

Almost surely, 2^72860173 is an apocalyptic number.

It is an amenable number.

72860173 is a deficient number, since it is larger than the sum of its proper divisors (24975).

72860173 is a wasteful number, since it uses less digits than its factorization.

72860173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24974.

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

The square root of 72860173 is about 8535.8170669245. The cubic root of 72860173 is about 417.6669068633. Note that the first 3 decimals are identical.

The spelling of 72860173 in words is "seventy-two million, eight hundred sixty thousand, one hundred seventy-three".