72254781 has 16 divisors (see below), whose sum is σ = 107524800. Its totient is φ = 47953584.

The previous prime is 72254773. The next prime is 72254789. The reversal of 72254781 is 18745227.

It is an interprime number because it is at equal distance from previous prime (72254773) and next prime (72254789).

It is not a de Polignac number, because 72254781 - 2³ = 72254773 is a prime.

It is a super-2 number, since 2×72254781² = 10441506754715922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72254789) 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 15 ways as a sum of consecutive naturals, for example, 235 + ... + 12023.

It is an arithmetic number, because the mean of its divisors is an integer number (6720300).

Almost surely, 2^72254781 is an apocalyptic number.

It is an amenable number.

72254781 is a deficient number, since it is larger than the sum of its proper divisors (35270019).

72254781 is a wasteful number, since it uses less digits than its factorization.

72254781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025 (or 12019 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 72254781 is about 8500.2812306417. The cubic root of 72254781 is about 416.5068960416.

The spelling of 72254781 in words is "seventy-two million, two hundred fifty-four thousand, seven hundred eighty-one".