72869121 has 12 divisors (see below), whose sum is σ = 113352148. Its totient is φ = 44842464.

The previous prime is 72869113. The next prime is 72869179. The reversal of 72869121 is 12196827.

It can be written as a sum of positive squares in 2 ways, for example, as 4161600 + 68707521 = 2040^2 + 8289^2 .

It is not a de Polignac number, because 72869121 - 2³ = 72869113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72868121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311290 + ... + 311523.

Almost surely, 2^72869121 is an apocalyptic number.

It is an amenable number.

72869121 is a deficient number, since it is larger than the sum of its proper divisors (40483027).

72869121 is a wasteful number, since it uses less digits than its factorization.

72869121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622832 (or 622829 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 72869121 is about 8536.3411951491. The cubic root of 72869121 is about 417.6840041349.

The spelling of 72869121 in words is "seventy-two million, eight hundred sixty-nine thousand, one hundred twenty-one".