28026251 has 8 divisors (see below), whose sum is σ = 32372784. Its totient is φ = 23979520.

The previous prime is 28026223. The next prime is 28026253. The reversal of 28026251 is 15262082.

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

It is a de Polignac number, because none of the positive numbers 2^k-28026251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28026251.

It is not an unprimeable number, because it can be changed into a prime (28026253) 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, 74750 + ... + 75123.

It is an arithmetic number, because the mean of its divisors is an integer number (4046598).

Almost surely, 2^28026251 is an apocalyptic number.

28026251 is a deficient number, since it is larger than the sum of its proper divisors (4346533).

28026251 is a wasteful number, since it uses less digits than its factorization.

28026251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149901.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28026251 is about 5293.9825273607. The cubic root of 28026251 is about 303.7537645669.

The spelling of 28026251 in words is "twenty-eight million, twenty-six thousand, two hundred fifty-one".