28906251 has 8 divisors (see below), whose sum is σ = 42045504. Its totient is φ = 17518920.

The previous prime is 28906249. The next prime is 28906259. The reversal of 28906251 is 15260982.

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

It is not a de Polignac number, because 28906251 - 2¹ = 28906249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 875947 = 28906251 / (2 + 8 + 9 + 0 + 6 + 2 + 5 + 1).

It is not an unprimeable number, because it can be changed into a prime (28906259) 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, 437941 + ... + 438006.

It is an arithmetic number, because the mean of its divisors is an integer number (5255688).

Almost surely, 2^28906251 is an apocalyptic number.

28906251 is a deficient number, since it is larger than the sum of its proper divisors (13139253).

28906251 is a wasteful number, since it uses less digits than its factorization.

28906251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875961.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 28906251 is about 5376.4533848998. The cubic root of 28906251 is about 306.9002600871.

The spelling of 28906251 in words is "twenty-eight million, nine hundred six thousand, two hundred fifty-one".