72331145 has 4 divisors (see below), whose sum is σ = 86797380. Its totient is φ = 57864912.

The previous prime is 72331139. The next prime is 72331151. The reversal of 72331145 is 54113327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54113327 = 113 ⋅478879.

It is an interprime number because it is at equal distance from previous prime (72331139) and next prime (72331151).

It can be written as a sum of positive squares in 2 ways, for example, as 56235001 + 16096144 = 7499^2 + 4012^2 .

It is a cyclic number.

It is not a de Polignac number, because 72331145 - 2²² = 68136841 is a prime.

It is a super-2 number, since 2×72331145² = 10463589074022050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7233110 + ... + 7233119.

It is an arithmetic number, because the mean of its divisors is an integer number (21699345).

Almost surely, 2^72331145 is an apocalyptic number.

It is an amenable number.

72331145 is a deficient number, since it is larger than the sum of its proper divisors (14466235).

72331145 is a wasteful number, since it uses less digits than its factorization.

72331145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14466234.

The product of its digits is 2520, while the sum is 26.

The square root of 72331145 is about 8504.7718958241. The cubic root of 72331145 is about 416.6535757665.

The spelling of 72331145 in words is "seventy-two million, three hundred thirty-one thousand, one hundred forty-five".