28278490 has 16 divisors (see below), whose sum is σ = 51985152. Its totient is φ = 11070544.

The previous prime is 28278487. The next prime is 28278493. The reversal of 28278490 is 9487282.

It is an interprime number because it is at equal distance from previous prime (28278487) and next prime (28278493).

It is not an unprimeable number, because it can be changed into a prime (28278493) 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, 29614 + ... + 30553.

It is an arithmetic number, because the mean of its divisors is an integer number (3249072).

Almost surely, 2^28278490 is an apocalyptic number.

28278490 is a deficient number, since it is larger than the sum of its proper divisors (23706662).

28278490 is a wasteful number, since it uses less digits than its factorization.

28278490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60221.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28278490 is about 5317.7523447412. The cubic root of 28278490 is about 304.6623155077.

The spelling of 28278490 in words is "twenty-eight million, two hundred seventy-eight thousand, four hundred ninety".