72264389 has 4 divisors (see below), whose sum is σ = 72979980. Its totient is φ = 71548800.

The previous prime is 72264383. The next prime is 72264403. The reversal of 72264389 is 98346227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98346227 = 7 ⋅14049461.

It can be written as a sum of positive squares in 2 ways, for example, as 56400100 + 15864289 = 7510^2 + 3983^2 .

It is a cyclic number.

It is not a de Polignac number, because 72264389 - 2⁴ = 72264373 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 (72264383) 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, 357644 + ... + 357845.

It is an arithmetic number, because the mean of its divisors is an integer number (18244995).

Almost surely, 2^72264389 is an apocalyptic number.

It is an amenable number.

72264389 is a deficient number, since it is larger than the sum of its proper divisors (715591).

72264389 is a wasteful number, since it uses less digits than its factorization.

72264389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715590.

The product of its digits is 145152, while the sum is 41.

The square root of 72264389 is about 8500.8463696270. The cubic root of 72264389 is about 416.5253567388.

The spelling of 72264389 in words is "seventy-two million, two hundred sixty-four thousand, three hundred eighty-nine".