72280457 has 2 divisors, whose sum is σ = 72280458. Its totient is φ = 72280456.

The previous prime is 72280409. The next prime is 72280459. The reversal of 72280457 is 75408227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72267001 + 13456 = 8501^2 + 116^2 .

It is an emirp because it is prime and its reverse (75408227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72280457 is a prime.

Together with 72280459, 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 (72280459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140228 + 36140229.

It is an arithmetic number, because the mean of its divisors is an integer number (36140229).

Almost surely, 2^72280457 is an apocalyptic number.

It is an amenable number.

72280457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72280457 is an equidigital number, since it uses as much as digits as its factorization.

72280457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 72280457 is about 8501.7913994640. The cubic root of 72280457 is about 416.5562259472.

The spelling of 72280457 in words is "seventy-two million, two hundred eighty thousand, four hundred fifty-seven".