72040691 has 2 divisors, whose sum is σ = 72040692. Its totient is φ = 72040690.

The previous prime is 72040687. The next prime is 72040693. The reversal of 72040691 is 19604027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72040691 - 2² = 72040687 is a prime.

It is a super-2 number, since 2×72040691² = 10379722319514962, which contains 22 as substring.

Together with 72040693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72040693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36020345 + 36020346.

It is an arithmetic number, because the mean of its divisors is an integer number (36020346).

Almost surely, 2^72040691 is an apocalyptic number.

72040691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72040691 is an equidigital number, since it uses as much as digits as its factorization.

72040691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 72040691 is about 8487.6787757313. The cubic root of 72040691 is about 416.0951208612.

The spelling of 72040691 in words is "seventy-two million, forty thousand, six hundred ninety-one".