72723457 has 2 divisors, whose sum is σ = 72723458. Its totient is φ = 72723456.

The previous prime is 72723451. The next prime is 72723461. The reversal of 72723457 is 75432727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69622336 + 3101121 = 8344^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 72723457 - 2¹¹ = 72721409 is a prime.

It is not a weakly prime, because it can be changed into another prime (72723451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36361728 + 36361729.

It is an arithmetic number, because the mean of its divisors is an integer number (36361729).

Almost surely, 2^72723457 is an apocalyptic number.

It is an amenable number.

72723457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72723457 is an equidigital number, since it uses as much as digits as its factorization.

72723457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 37.

The square root of 72723457 is about 8527.8049344483. The cubic root of 72723457 is about 417.4055043288.

The spelling of 72723457 in words is "seventy-two million, seven hundred twenty-three thousand, four hundred fifty-seven".