72043669 has 2 divisors, whose sum is σ = 72043670. Its totient is φ = 72043668.

The previous prime is 72043667. The next prime is 72043681. The reversal of 72043669 is 96634027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68260644 + 3783025 = 8262^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 72043669 - 2¹ = 72043667 is a prime.

It is a super-2 number, since 2×72043669² = 10380580485963122, which contains 22 as substring.

Together with 72043667, 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 (72043667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36021834 + 36021835.

It is an arithmetic number, because the mean of its divisors is an integer number (36021835).

Almost surely, 2^72043669 is an apocalyptic number.

It is an amenable number.

72043669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72043669 is an equidigital number, since it uses as much as digits as its factorization.

72043669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 72043669 is about 8487.8542046857. The cubic root of 72043669 is about 416.1008542607.

The spelling of 72043669 in words is "seventy-two million, forty-three thousand, six hundred sixty-nine".