72040693 has 2 divisors, whose sum is σ = 72040694. Its totient is φ = 72040692.

The previous prime is 72040691. The next prime is 72040721. The reversal of 72040693 is 39604027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57729604 + 14311089 = 7598^2 + 3783^2 .

It is a cyclic number.

It is not a de Polignac number, because 72040693 - 2¹ = 72040691 is a prime.

It is a super-2 number, since 2×72040693² = 10379722895840498, which contains 22 as substring.

Together with 72040691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72040691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36020346 + 36020347.

It is an arithmetic number, because the mean of its divisors is an integer number (36020347).

Almost surely, 2^72040693 is an apocalyptic number.

It is an amenable number.

72040693 is a deficient number, since it is larger than the sum of its proper divisors (1).

72040693 is an equidigital number, since it uses as much as digits as its factorization.

72040693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 72040693 is about 8487.6788935492. The cubic root of 72040693 is about 416.0951247117.

The spelling of 72040693 in words is "seventy-two million, forty thousand, six hundred ninety-three".