72797819 has 2 divisors, whose sum is σ = 72797820. Its totient is φ = 72797818.

The previous prime is 72797807. The next prime is 72797843. The reversal of 72797819 is 91879727.

It is a weak prime.

It is an emirp because it is prime and its reverse (91879727) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72797819 is a prime.

It is a super-2 number, since 2×72797819² = 10599044902313522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72797899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36398909 + 36398910.

It is an arithmetic number, because the mean of its divisors is an integer number (36398910).

Almost surely, 2^72797819 is an apocalyptic number.

72797819 is a deficient number, since it is larger than the sum of its proper divisors (1).

72797819 is an equidigital number, since it uses as much as digits as its factorization.

72797819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 50.

The square root of 72797819 is about 8532.1637935520. The cubic root of 72797819 is about 417.5477259077.

The spelling of 72797819 in words is "seventy-two million, seven hundred ninety-seven thousand, eight hundred nineteen".