72790173 has 6 divisors (see below), whose sum is σ = 105141374. Its totient is φ = 48526776.

The previous prime is 72790127. The next prime is 72790181. The reversal of 72790173 is 37109727.

It can be written as a sum of positive squares in only one way, i.e., 70107129 + 2683044 = 8373^2 + 1638^2 .

It is not a de Polignac number, because 72790173 - 2²⁶ = 5681309 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 (72790103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4043890 + ... + 4043907.

Almost surely, 2^72790173 is an apocalyptic number.

It is an amenable number.

72790173 is a deficient number, since it is larger than the sum of its proper divisors (32351201).

72790173 is a wasteful number, since it uses less digits than its factorization.

72790173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8087803 (or 8087800 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 72790173 is about 8531.7157125633. The cubic root of 72790173 is about 417.5331069638.

It can be divided in two parts, 7279017 and 3, that added together give a triangular number (7279020 = T₃₈₁₅).

The spelling of 72790173 in words is "seventy-two million, seven hundred ninety thousand, one hundred seventy-three".