72675521 has 2 divisors, whose sum is σ = 72675522. Its totient is φ = 72675520.

The previous prime is 72675517. The next prime is 72675523. The reversal of 72675521 is 12557627.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54228496 + 18447025 = 7364^2 + 4295^2 .

It is a cyclic number.

It is not a de Polignac number, because 72675521 - 2² = 72675517 is a prime.

Together with 72675523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72675523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36337760 + 36337761.

It is an arithmetic number, because the mean of its divisors is an integer number (36337761).

Almost surely, 2^72675521 is an apocalyptic number.

It is an amenable number.

72675521 is a deficient number, since it is larger than the sum of its proper divisors (1).

72675521 is an equidigital number, since it uses as much as digits as its factorization.

72675521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 35.

The square root of 72675521 is about 8524.9939002911. The cubic root of 72675521 is about 417.3137725869.

The spelling of 72675521 in words is "seventy-two million, six hundred seventy-five thousand, five hundred twenty-one".