72905869 has 4 divisors (see below), whose sum is σ = 76743040. Its totient is φ = 69068700.

The previous prime is 72905827. The next prime is 72905891. The reversal of 72905869 is 96850927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72905869 - 2¹¹ = 72903821 is a prime.

It is a super-2 number, since 2×72905869² = 10630531469290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72905969) 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, 1918557 + ... + 1918594.

It is an arithmetic number, because the mean of its divisors is an integer number (19185760).

Almost surely, 2^72905869 is an apocalyptic number.

It is an amenable number.

72905869 is a deficient number, since it is larger than the sum of its proper divisors (3837171).

72905869 is a wasteful number, since it uses less digits than its factorization.

72905869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3837170.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 72905869 is about 8538.4933682705. The cubic root of 72905869 is about 417.7542052119.

The spelling of 72905869 in words is "seventy-two million, nine hundred five thousand, eight hundred sixty-nine".