72917963 has 2 divisors, whose sum is σ = 72917964. Its totient is φ = 72917962.

The previous prime is 72917941. The next prime is 72917987. The reversal of 72917963 is 36971927.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (36971927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72917963 - 2⁸ = 72917707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (72917263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36458981 + 36458982.

It is an arithmetic number, because the mean of its divisors is an integer number (36458982).

Almost surely, 2^72917963 is an apocalyptic number.

72917963 is a deficient number, since it is larger than the sum of its proper divisors (1).

72917963 is an equidigital number, since it uses as much as digits as its factorization.

72917963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 72917963 is about 8539.2015434700. The cubic root of 72917963 is about 417.7773036725. Note that the first 3 decimals are identical.

The spelling of 72917963 in words is "seventy-two million, nine hundred seventeen thousand, nine hundred sixty-three".