72731807 has 2 divisors, whose sum is σ = 72731808. Its totient is φ = 72731806.

The previous prime is 72731801. The next prime is 72731833. The reversal of 72731807 is 70813727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72731807 - 2⁸ = 72731551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72731801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36365903 + 36365904.

It is an arithmetic number, because the mean of its divisors is an integer number (36365904).

Almost surely, 2^72731807 is an apocalyptic number.

72731807 is a deficient number, since it is larger than the sum of its proper divisors (1).

72731807 is an equidigital number, since it uses as much as digits as its factorization.

72731807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 72731807 is about 8528.2944953842. The cubic root of 72731807 is about 417.4214790121.

The spelling of 72731807 in words is "seventy-two million, seven hundred thirty-one thousand, eight hundred seven".