72847997 has 2 divisors, whose sum is σ = 72847998. Its totient is φ = 72847996.

The previous prime is 72847991. The next prime is 72848011. The reversal of 72847997 is 79974827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38613796 + 34234201 = 6214^2 + 5851^2 .

It is a cyclic number.

It is not a de Polignac number, because 72847997 - 2⁸ = 72847741 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 (72847991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36423998 + 36423999.

It is an arithmetic number, because the mean of its divisors is an integer number (36423999).

Almost surely, 2^72847997 is an apocalyptic number.

It is an amenable number.

72847997 is a deficient number, since it is larger than the sum of its proper divisors (1).

72847997 is an equidigital number, since it uses as much as digits as its factorization.

72847997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The square root of 72847997 is about 8535.1038072187. The cubic root of 72847997 is about 417.6436394853.

The spelling of 72847997 in words is "seventy-two million, eight hundred forty-seven thousand, nine hundred ninety-seven".