72825281 has 4 divisors (see below), whose sum is σ = 73747200. Its totient is φ = 71903364.

The previous prime is 72825257. The next prime is 72825299. The reversal of 72825281 is 18252827.

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.

It is a cyclic number.

It is not a de Polignac number, because 72825281 - 2⁶ = 72825217 is a prime.

It is a super-2 number, since 2×72825281² = 10607043105457922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72825211) 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, 460841 + ... + 460998.

It is an arithmetic number, because the mean of its divisors is an integer number (18436800).

Almost surely, 2^72825281 is an apocalyptic number.

It is an amenable number.

72825281 is a deficient number, since it is larger than the sum of its proper divisors (921919).

72825281 is an equidigital number, since it uses as much as digits as its factorization.

72825281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921918.

The product of its digits is 17920, while the sum is 35.

The square root of 72825281 is about 8533.7729639357. The cubic root of 72825281 is about 417.6002240650.

The spelling of 72825281 in words is "seventy-two million, eight hundred twenty-five thousand, two hundred eighty-one".