28783420 has 12 divisors (see below), whose sum is σ = 60445224. Its totient is φ = 11513360.

The previous prime is 28783409. The next prime is 28783421. The reversal of 28783420 is 2438782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28783421) 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, 719566 + ... + 719605.

It is an arithmetic number, because the mean of its divisors is an integer number (5037102).

Almost surely, 2^28783420 is an apocalyptic number.

28783420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28783420 is an abundant number, since it is smaller than the sum of its proper divisors (31661804).

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

28783420 is a wasteful number, since it uses less digits than its factorization.

28783420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439180 (or 1439178 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 28783420 is about 5365.0181733150. The cubic root of 28783420 is about 306.4649403217.

The spelling of 28783420 in words is "twenty-eight million, seven hundred eighty-three thousand, four hundred twenty".