72207769 has 4 divisors (see below), whose sum is σ = 72224820. Its totient is φ = 72190720.

The previous prime is 72207763. The next prime is 72207827. The reversal of 72207769 is 96770227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17640000 + 54567769 = 4200^2 + 7387^2 .

It is a cyclic number.

It is not a de Polignac number, because 72207769 - 2³ = 72207761 is a prime.

It is a super-2 number, since 2×72207769² = 10427923807914722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72207761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3237 + ... + 12445.

It is an arithmetic number, because the mean of its divisors is an integer number (18056205).

Almost surely, 2^72207769 is an apocalyptic number.

It is an amenable number.

72207769 is a deficient number, since it is larger than the sum of its proper divisors (17051).

72207769 is an equidigital number, since it uses as much as digits as its factorization.

72207769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17050.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 72207769 is about 8497.5154604155. The cubic root of 72207769 is about 416.4165441408.

The spelling of 72207769 in words is "seventy-two million, two hundred seven thousand, seven hundred sixty-nine".