28789400 has 24 divisors (see below), whose sum is σ = 66935820. Its totient is φ = 11515680.

The previous prime is 28789393. The next prime is 28789429. The reversal of 28789400 is 498782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71774 + ... + 72173.

Almost surely, 2^28789400 is an apocalyptic number.

28789400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28789400 is an abundant number, since it is smaller than the sum of its proper divisors (38146420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28789400 is a wasteful number, since it uses less digits than its factorization.

28789400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143963 (or 143954 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28789400 is about 5365.5754584201. The cubic root of 28789400 is about 306.4861624169.

The spelling of 28789400 in words is "twenty-eight million, seven hundred eighty-nine thousand, four hundred".