72245861 has 4 divisors (see below), whose sum is σ = 72301632. Its totient is φ = 72190092.

The previous prime is 72245857. The next prime is 72245863. The reversal of 72245861 is 16854227.

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 72245861 - 2² = 72245857 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 (72245863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25895 + ... + 28548.

It is an arithmetic number, because the mean of its divisors is an integer number (18075408).

Almost surely, 2^72245861 is an apocalyptic number.

It is an amenable number.

72245861 is a deficient number, since it is larger than the sum of its proper divisors (55771).

72245861 is a wasteful number, since it uses less digits than its factorization.

72245861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55770.

The product of its digits is 26880, while the sum is 35.

The square root of 72245861 is about 8499.7565259247. The cubic root of 72245861 is about 416.4897557945.

The spelling of 72245861 in words is "seventy-two million, two hundred forty-five thousand, eight hundred sixty-one".