72245657 has 8 divisors (see below), whose sum is σ = 82961760. Its totient is φ = 62220960.

The previous prime is 72245647. The next prime is 72245669. The reversal of 72245657 is 75654227.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72245657 - 2¹⁴ = 72229273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72245657.

It is not an unprimeable number, because it can be changed into a prime (72245647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172628 + ... + 173045.

It is an arithmetic number, because the mean of its divisors is an integer number (10370220).

Almost surely, 2^72245657 is an apocalyptic number.

It is an amenable number.

72245657 is a deficient number, since it is larger than the sum of its proper divisors (10716103).

72245657 is a wasteful number, since it uses less digits than its factorization.

72245657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345703.

The product of its digits is 117600, while the sum is 38.

The square root of 72245657 is about 8499.7445255725. The cubic root of 72245657 is about 416.4893637813.

The spelling of 72245657 in words is "seventy-two million, two hundred forty-five thousand, six hundred fifty-seven".