72685769 has 4 divisors (see below), whose sum is σ = 78276996. Its totient is φ = 67094544.

The previous prime is 72685763. The next prime is 72685771. The reversal of 72685769 is 96758627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36240400 + 36445369 = 6020^2 + 6037^2 .

It is a cyclic number.

It is not a de Polignac number, because 72685769 - 2¹² = 72681673 is a prime.

It is a super-2 number, since 2×72685769² = 10566442030242722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72685763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2795594 + ... + 2795619.

It is an arithmetic number, because the mean of its divisors is an integer number (19569249).

Almost surely, 2^72685769 is an apocalyptic number.

It is an amenable number.

72685769 is a deficient number, since it is larger than the sum of its proper divisors (5591227).

72685769 is a wasteful number, since it uses less digits than its factorization.

72685769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591226.

The product of its digits is 1270080, while the sum is 50.

The square root of 72685769 is about 8525.5949352523. The cubic root of 72685769 is about 417.3333868508. Note that the first 4 decimals are identical.

The spelling of 72685769 in words is "seventy-two million, six hundred eighty-five thousand, seven hundred sixty-nine".