72199581 has 8 divisors (see below), whose sum is σ = 96385824. Its totient is φ = 48073200.

The previous prime is 72199579. The next prime is 72199591. The reversal of 72199581 is 18599127.

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

It is not a de Polignac number, because 72199581 - 2¹ = 72199579 is a prime.

It is a super-2 number, since 2×72199581² = 10425558993151122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72199511) 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, 12070 + ... + 17031.

It is an arithmetic number, because the mean of its divisors is an integer number (12048228).

Almost surely, 2^72199581 is an apocalyptic number.

It is an amenable number.

72199581 is a deficient number, since it is larger than the sum of its proper divisors (24186243).

72199581 is a wasteful number, since it uses less digits than its factorization.

72199581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29931.

The product of its digits is 45360, while the sum is 42.

The square root of 72199581 is about 8497.0336588718. The cubic root of 72199581 is about 416.4008036944.

The spelling of 72199581 in words is "seventy-two million, one hundred ninety-nine thousand, five hundred eighty-one".