72232277 has 4 divisors (see below), whose sum is σ = 77788620. Its totient is φ = 66675936.

The previous prime is 72232273. The next prime is 72232289. The reversal of 72232277 is 77223227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77223227 = 43 ⋅1795889.

It can be written as a sum of positive squares in 2 ways, for example, as 38056561 + 34175716 = 6169^2 + 5846^2 .

It is a cyclic number.

It is not a de Polignac number, because 72232277 - 2² = 72232273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72232273) 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 3 ways as a sum of consecutive naturals, for example, 2778152 + ... + 2778177.

It is an arithmetic number, because the mean of its divisors is an integer number (19447155).

Almost surely, 2^72232277 is an apocalyptic number.

It is an amenable number.

72232277 is a deficient number, since it is larger than the sum of its proper divisors (5556343).

72232277 is a wasteful number, since it uses less digits than its factorization.

72232277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556342.

The product of its digits is 16464, while the sum is 32.

The square root of 72232277 is about 8498.9574066470. The cubic root of 72232277 is about 416.4636507167.

The spelling of 72232277 in words is "seventy-two million, two hundred thirty-two thousand, two hundred seventy-seven".