72872779 has 4 divisors (see below), whose sum is σ = 83283184. Its totient is φ = 62462376.

The previous prime is 72872777. The next prime is 72872819. The reversal of 72872779 is 97727827.

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

It is a cyclic number.

It is not a de Polignac number, because 72872779 - 2¹ = 72872777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72872777) 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, 5205192 + ... + 5205205.

It is an arithmetic number, because the mean of its divisors is an integer number (20820796).

Almost surely, 2^72872779 is an apocalyptic number.

72872779 is a deficient number, since it is larger than the sum of its proper divisors (10410405).

72872779 is a wasteful number, since it uses less digits than its factorization.

72872779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410404.

The product of its digits is 691488, while the sum is 49.

The square root of 72872779 is about 8536.5554528744. Note that the first 3 decimals coincide. The cubic root of 72872779 is about 417.6909932066.

The spelling of 72872779 in words is "seventy-two million, eight hundred seventy-two thousand, seven hundred seventy-nine".