72004981 has 2 divisors, whose sum is σ = 72004982. Its totient is φ = 72004980.

The previous prime is 72004969. The next prime is 72005023. The reversal of 72004981 is 18940027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 13727025 = 7634^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 72004981 - 2⁷ = 72004853 is a prime.

It is a super-2 number, since 2×72004981² = 10369434577620722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72004921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36002490 + 36002491.

It is an arithmetic number, because the mean of its divisors is an integer number (36002491).

Almost surely, 2^72004981 is an apocalyptic number.

It is an amenable number.

72004981 is a deficient number, since it is larger than the sum of its proper divisors (1).

72004981 is an equidigital number, since it uses as much as digits as its factorization.

72004981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 72004981 is about 8485.5748774022. The cubic root of 72004981 is about 416.0263578128.

The spelling of 72004981 in words is "seventy-two million, four thousand, nine hundred eighty-one".