28228701 has 8 divisors (see below), whose sum is σ = 38348640. Its totient is φ = 18463952.

The previous prime is 28228691. The next prime is 28228709. The reversal of 28228701 is 10782282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28228701 - 2⁷ = 28228573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88611 + ... + 88928.

It is an arithmetic number, because the mean of its divisors is an integer number (4793580).

Almost surely, 2^28228701 is an apocalyptic number.

It is an amenable number.

28228701 is a deficient number, since it is larger than the sum of its proper divisors (10119939).

28228701 is a wasteful number, since it uses less digits than its factorization.

28228701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177595.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28228701 is about 5313.0688871875. The cubic root of 28228701 is about 304.4834075207.

The spelling of 28228701 in words is "twenty-eight million, two hundred twenty-eight thousand, seven hundred one".