28922257 has 8 divisors (see below), whose sum is σ = 35596736. Its totient is φ = 22883472.

The previous prime is 28922233. The next prime is 28922269. The reversal of 28922257 is 75222982.

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 28922257 - 2¹⁹ = 28397969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28922857) 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, 158823 + ... + 159004.

It is an arithmetic number, because the mean of its divisors is an integer number (4449592).

Almost surely, 2^28922257 is an apocalyptic number.

It is an amenable number.

28922257 is a deficient number, since it is larger than the sum of its proper divisors (6674479).

28922257 is a wasteful number, since it uses less digits than its factorization.

28922257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317847.

The product of its digits is 40320, while the sum is 37.

The square root of 28922257 is about 5377.9417066383. The cubic root of 28922257 is about 306.9568953476.

The spelling of 28922257 in words is "twenty-eight million, nine hundred twenty-two thousand, two hundred fifty-seven".