72240857 has 8 divisors (see below), whose sum is σ = 78126720. Its totient is φ = 66402000.

The previous prime is 72240853. The next prime is 72240863. The reversal of 72240857 is 75804227.

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 72240857 - 2² = 72240853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72240853) 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, 8519 + ... + 14732.

It is an arithmetic number, because the mean of its divisors is an integer number (9765840).

Almost surely, 2^72240857 is an apocalyptic number.

It is an amenable number.

72240857 is a deficient number, since it is larger than the sum of its proper divisors (5885863).

72240857 is a wasteful number, since it uses less digits than its factorization.

72240857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23503.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 72240857 is about 8499.4621594546. The cubic root of 72240857 is about 416.4801397287.

The spelling of 72240857 in words is "seventy-two million, two hundred forty thousand, eight hundred fifty-seven".