28278651 has 8 divisors (see below), whose sum is σ = 37788160. Its totient is φ = 18810792.

The previous prime is 28278617. The next prime is 28278671. The reversal of 28278651 is 15687282.

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

It is not a de Polignac number, because 28278651 - 2⁶ = 28278587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28278671) 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, 8791 + ... + 11568.

It is an arithmetic number, because the mean of its divisors is an integer number (4723520).

Almost surely, 2^28278651 is an apocalyptic number.

28278651 is a deficient number, since it is larger than the sum of its proper divisors (9509509).

28278651 is a wasteful number, since it uses less digits than its factorization.

28278651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20825.

The product of its digits is 53760, while the sum is 39.

The square root of 28278651 is about 5317.7674826942. The cubic root of 28278651 is about 304.6628936920.

The spelling of 28278651 in words is "twenty-eight million, two hundred seventy-eight thousand, six hundred fifty-one".