72857228 has 12 divisors (see below), whose sum is σ = 127594152. Its totient is φ = 36401760.

The previous prime is 72857221. The next prime is 72857237. The reversal of 72857228 is 82275827.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72857221) 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, 176 + ... + 12072.

It is an arithmetic number, because the mean of its divisors is an integer number (10632846).

Almost surely, 2^72857228 is an apocalyptic number.

It is an amenable number.

72857228 is a deficient number, since it is larger than the sum of its proper divisors (54736924).

72857228 is a wasteful number, since it uses less digits than its factorization.

72857228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13432 (or 13430 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 72857228 is about 8535.6445567983. The cubic root of 72857228 is about 417.6612794377.

The spelling of 72857228 in words is "seventy-two million, eight hundred fifty-seven thousand, two hundred twenty-eight".