72102981 has 8 divisors (see below), whose sum is σ = 96231520. Its totient is φ = 48021552.

The previous prime is 72102937. The next prime is 72102983. The reversal of 72102981 is 18920127.

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

It is not a de Polignac number, because 72102981 - 2¹¹ = 72100933 is a prime.

It is a super-2 number, since 2×72102981² = 10397679738172722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72102983) 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, 8035 + ... + 14448.

It is an arithmetic number, because the mean of its divisors is an integer number (12028940).

Almost surely, 2^72102981 is an apocalyptic number.

It is an amenable number.

72102981 is a deficient number, since it is larger than the sum of its proper divisors (24128539).

72102981 is a wasteful number, since it uses less digits than its factorization.

72102981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23555.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 72102981 is about 8491.3474195795. The cubic root of 72102981 is about 416.2150118938.

The spelling of 72102981 in words is "seventy-two million, one hundred two thousand, nine hundred eighty-one".