72821269 has 2 divisors, whose sum is σ = 72821270. Its totient is φ = 72821268.

The previous prime is 72821267. The next prime is 72821297. The reversal of 72821269 is 96212827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72029169 + 792100 = 8487^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 72821269 - 2¹ = 72821267 is a prime.

It is a super-2 number, since 2×72821269² = 10605874437540722, which contains 22 as substring.

Together with 72821267, 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 (72821267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36410634 + 36410635.

It is an arithmetic number, because the mean of its divisors is an integer number (36410635).

Almost surely, 2^72821269 is an apocalyptic number.

It is an amenable number.

72821269 is a deficient number, since it is larger than the sum of its proper divisors (1).

72821269 is an equidigital number, since it uses as much as digits as its factorization.

72821269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 72821269 is about 8533.5378946835. The cubic root of 72821269 is about 417.5925552864.

The spelling of 72821269 in words is "seventy-two million, eight hundred twenty-one thousand, two hundred sixty-nine".