28722556 has 12 divisors (see below), whose sum is σ = 50573992. Its totient is φ = 14272848.

The previous prime is 28722539. The next prime is 28722587. The reversal of 28722556 is 65522782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21375 + ... + 22678.

Almost surely, 2^28722556 is an apocalyptic number.

It is an amenable number.

28722556 is a deficient number, since it is larger than the sum of its proper divisors (21851436).

28722556 is a wasteful number, since it uses less digits than its factorization.

28722556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44220 (or 44218 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 28722556 is about 5359.3428701661. The cubic root of 28722556 is about 306.2487760051.

The spelling of 28722556 in words is "twenty-eight million, seven hundred twenty-two thousand, five hundred fifty-six".