72281425 has 6 divisors (see below), whose sum is σ = 89628998. Its totient is φ = 57825120.

The previous prime is 72281423. The next prime is 72281437. The reversal of 72281425 is 52418227.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7059649 + 65221776 = 2657^2 + 8076^2 .

It is not a de Polignac number, because 72281425 - 2¹ = 72281423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72281423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1445604 + ... + 1445653.

Almost surely, 2^72281425 is an apocalyptic number.

It is an amenable number.

72281425 is a deficient number, since it is larger than the sum of its proper divisors (17347573).

72281425 is a wasteful number, since it uses less digits than its factorization.

72281425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891267 (or 2891262 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 72281425 is about 8501.8483284519. The cubic root of 72281425 is about 416.5580854845.

The spelling of 72281425 in words is "seventy-two million, two hundred eighty-one thousand, four hundred twenty-five".