28722030 has 32 divisors (see below), whose sum is σ = 69811200. Its totient is φ = 7561632.

The previous prime is 28722019. The next prime is 28722047. The reversal of 28722030 is 3022782.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3690 + ... + 8429.

It is an arithmetic number, because the mean of its divisors is an integer number (2181600).

Almost surely, 2^28722030 is an apocalyptic number.

28722030 is an abundant number, since it is smaller than the sum of its proper divisors (41089170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28722030 is a wasteful number, since it uses less digits than its factorization.

28722030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12208.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 28722030 is about 5359.2937967609. The cubic root of 28722030 is about 306.2469065355.

The spelling of 28722030 in words is "twenty-eight million, seven hundred twenty-two thousand, thirty".