72149273 has 4 divisors (see below), whose sum is σ = 82456320. Its totient is φ = 61842228.

The previous prime is 72149263. The next prime is 72149291. The reversal of 72149273 is 37294127.

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: 37294127 = 13 ⋅2868779.

It is not a de Polignac number, because 72149273 - 2¹⁸ = 71887129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72149243) 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, 5153513 + ... + 5153526.

It is an arithmetic number, because the mean of its divisors is an integer number (20614080).

Almost surely, 2^72149273 is an apocalyptic number.

It is an amenable number.

72149273 is a deficient number, since it is larger than the sum of its proper divisors (10307047).

72149273 is a wasteful number, since it uses less digits than its factorization.

72149273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10307046.

The product of its digits is 21168, while the sum is 35.

The square root of 72149273 is about 8494.0728157934. The cubic root of 72149273 is about 416.3040664800.

It can be divided in two parts, 721 and 49273, that added together give a palindrome (49994).

The spelling of 72149273 in words is "seventy-two million, one hundred forty-nine thousand, two hundred seventy-three".