72226981 has 8 divisors (see below), whose sum is σ = 73221984. Its totient is φ = 71238960.

The previous prime is 72226949. The next prime is 72226991. The reversal of 72226981 is 18962227.

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 72226981 - 2⁵ = 72226949 is a prime.

It is a super-2 number, since 2×72226981² = 10433473568748722, which contains 22 as substring.

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 72226981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72226991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21070 + ... + 24256.

It is an arithmetic number, because the mean of its divisors is an integer number (9152748).

Almost surely, 2^72226981 is an apocalyptic number.

It is an amenable number.

72226981 is a deficient number, since it is larger than the sum of its proper divisors (995003).

72226981 is a wasteful number, since it uses less digits than its factorization.

72226981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491.

The product of its digits is 24192, while the sum is 37.

The square root of 72226981 is about 8498.6458333078. The cubic root of 72226981 is about 416.4534722319.

The spelling of 72226981 in words is "seventy-two million, two hundred twenty-six thousand, nine hundred eighty-one".