28263278 has 8 divisors (see below), whose sum is σ = 42832272. Its totient is φ = 13985856.

The previous prime is 28263271. The next prime is 28263281. The reversal of 28263278 is 87236282.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28263271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72650 + ... + 73037.

It is an arithmetic number, because the mean of its divisors is an integer number (5354034).

Almost surely, 2^28263278 is an apocalyptic number.

28263278 is a deficient number, since it is larger than the sum of its proper divisors (14568994).

28263278 is a wasteful number, since it uses less digits than its factorization.

28263278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145786.

The product of its digits is 64512, while the sum is 38.

The square root of 28263278 is about 5316.3218487973. The cubic root of 28263278 is about 304.6076761638.

The spelling of 28263278 in words is "twenty-eight million, two hundred sixty-three thousand, two hundred seventy-eight".