72530981 has 8 divisors (see below), whose sum is σ = 74446944. Its totient is φ = 70625520.

The previous prime is 72530963. The next prime is 72530987. The reversal of 72530981 is 18903527.

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 72530981 - 2²² = 68336677 is a prime.

It is a super-2 number, since 2×72530981² = 10521486409644722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72530987) 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, 12491 + ... + 17351.

It is an arithmetic number, because the mean of its divisors is an integer number (9305868).

Almost surely, 2^72530981 is an apocalyptic number.

It is an amenable number.

72530981 is a deficient number, since it is larger than the sum of its proper divisors (1915963).

72530981 is a wasteful number, since it uses less digits than its factorization.

72530981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 72530981 is about 8516.5122556126. The cubic root of 72530981 is about 417.0369321686.

The spelling of 72530981 in words is "seventy-two million, five hundred thirty thousand, nine hundred eighty-one".