28978503 has 8 divisors (see below), whose sum is σ = 38834928. Its totient is φ = 19220544.

The previous prime is 28978501. The next prime is 28978507. The reversal of 28978503 is 30587982.

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

It is not a de Polignac number, because 28978503 - 2¹ = 28978501 is a prime.

It is a super-2 number, since 2×28978503² = 1679507272242018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978501) 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, 23926 + ... + 25107.

It is an arithmetic number, because the mean of its divisors is an integer number (4854366).

Almost surely, 2^28978503 is an apocalyptic number.

28978503 is a deficient number, since it is larger than the sum of its proper divisors (9856425).

28978503 is a wasteful number, since it uses less digits than its factorization.

28978503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49233.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 28978503 is about 5383.1684907682. The cubic root of 28978503 is about 307.1557493262.

The spelling of 28978503 in words is "twenty-eight million, nine hundred seventy-eight thousand, five hundred three".