28215254 has 8 divisors (see below), whose sum is σ = 42445200. Its totient is φ = 14066856.

The previous prime is 28215221. The next prime is 28215277. The reversal of 28215254 is 45251282.

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

It is a super-2 number, since 2×28215254² = 1592201116569032, which contains 22 as substring.

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, 19514 + ... + 20909.

It is an arithmetic number, because the mean of its divisors is an integer number (5305650).

Almost surely, 2^28215254 is an apocalyptic number.

28215254 is a deficient number, since it is larger than the sum of its proper divisors (14229946).

28215254 is a wasteful number, since it uses less digits than its factorization.

28215254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40774.

The product of its digits is 6400, while the sum is 29.

The square root of 28215254 is about 5311.8032719595. The cubic root of 28215254 is about 304.4350520227.

The spelling of 28215254 in words is "twenty-eight million, two hundred fifteen thousand, two hundred fifty-four".