72997819 has 2 divisors, whose sum is σ = 72997820. Its totient is φ = 72997818.

The previous prime is 72997807. The next prime is 72997823. The reversal of 72997819 is 91879927.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72997819 - 2¹¹ = 72995771 is a prime.

It is a super-2 number, since 2×72997819² = 10657363157513522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72997849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36498909 + 36498910.

It is an arithmetic number, because the mean of its divisors is an integer number (36498910).

Almost surely, 2^72997819 is an apocalyptic number.

72997819 is a deficient number, since it is larger than the sum of its proper divisors (1).

72997819 is an equidigital number, since it uses as much as digits as its factorization.

72997819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 52.

The square root of 72997819 is about 8543.8761109932. The cubic root of 72997819 is about 417.9297574328.

The spelling of 72997819 in words is "seventy-two million, nine hundred ninety-seven thousand, eight hundred nineteen".