72604381 has 2 divisors, whose sum is σ = 72604382. Its totient is φ = 72604380.

The previous prime is 72604373. The next prime is 72604409. The reversal of 72604381 is 18340627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71673156 + 931225 = 8466^2 + 965^2 .

It is an emirp because it is prime and its reverse (18340627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72604381 - 2³ = 72604373 is a prime.

It is a super-2 number, since 2×72604381² = 10542792280786322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72604351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36302190 + 36302191.

It is an arithmetic number, because the mean of its divisors is an integer number (36302191).

Almost surely, 2^72604381 is an apocalyptic number.

It is an amenable number.

72604381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72604381 is an equidigital number, since it uses as much as digits as its factorization.

72604381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 72604381 is about 8520.8204417180. The cubic root of 72604381 is about 417.1775626066.

The spelling of 72604381 in words is "seventy-two million, six hundred four thousand, three hundred eighty-one".