72505723 has 2 divisors, whose sum is σ = 72505724. Its totient is φ = 72505722.

The previous prime is 72505721. The next prime is 72505733. The reversal of 72505723 is 32750527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72505723 - 2¹ = 72505721 is a prime.

Together with 72505721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72505721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36252861 + 36252862.

It is an arithmetic number, because the mean of its divisors is an integer number (36252862).

Almost surely, 2^72505723 is an apocalyptic number.

72505723 is a deficient number, since it is larger than the sum of its proper divisors (1).

72505723 is an equidigital number, since it uses as much as digits as its factorization.

72505723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 72505723 is about 8515.0292424630. The cubic root of 72505723 is about 416.9885172630.

The spelling of 72505723 in words is "seventy-two million, five hundred five thousand, seven hundred twenty-three".