72367991 has 2 divisors, whose sum is σ = 72367992. Its totient is φ = 72367990.

The previous prime is 72367951. The next prime is 72368003. The reversal of 72367991 is 19976327.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72367991 - 2²⁶ = 5259127 is a prime.

It is a super-2 number, since 2×72367991² = 10474252242752162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72367931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36183995 + 36183996.

It is an arithmetic number, because the mean of its divisors is an integer number (36183996).

Almost surely, 2^72367991 is an apocalyptic number.

72367991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72367991 is an equidigital number, since it uses as much as digits as its factorization.

72367991 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 72367991 is about 8506.9378156890. The cubic root of 72367991 is about 416.7243125221.

The spelling of 72367991 in words is "seventy-two million, three hundred sixty-seven thousand, nine hundred ninety-one".