72414721 has 2 divisors, whose sum is σ = 72414722. Its totient is φ = 72414720.

The previous prime is 72414703. The next prime is 72414737. The reversal of 72414721 is 12741427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46036225 + 26378496 = 6785^2 + 5136^2 .

It is an emirp because it is prime and its reverse (12741427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72414721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72414721.

It is not a weakly prime, because it can be changed into another prime (72414751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36207360 + 36207361.

It is an arithmetic number, because the mean of its divisors is an integer number (36207361).

Almost surely, 2^72414721 is an apocalyptic number.

It is an amenable number.

72414721 is a deficient number, since it is larger than the sum of its proper divisors (1).

72414721 is an equidigital number, since it uses as much as digits as its factorization.

72414721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 28.

The square root of 72414721 is about 8509.6839541783. The cubic root of 72414721 is about 416.8139900016.

The spelling of 72414721 in words is "seventy-two million, four hundred fourteen thousand, seven hundred twenty-one".