72608981 has 4 divisors (see below), whose sum is σ = 73483872. Its totient is φ = 71734092.

The previous prime is 72608969. The next prime is 72609007. The reversal of 72608981 is 18980627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18980627 = 101 ⋅187927.

It is a cyclic number.

It is not a de Polignac number, because 72608981 - 2¹⁰ = 72607957 is a prime.

It is a super-2 number, since 2×72608981² = 10544128243716722, 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 (72604981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437321 + ... + 437486.

It is an arithmetic number, because the mean of its divisors is an integer number (18370968).

Almost surely, 2^72608981 is an apocalyptic number.

It is an amenable number.

72608981 is a deficient number, since it is larger than the sum of its proper divisors (874891).

72608981 is an equidigital number, since it uses as much as digits as its factorization.

72608981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874890.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 72608981 is about 8521.0903645015. The cubic root of 72608981 is about 417.1863728015.

The spelling of 72608981 in words is "seventy-two million, six hundred eight thousand, nine hundred eighty-one".