28438700 has 18 divisors (see below), whose sum is σ = 61712196. Its totient is φ = 11375440.

The previous prime is 28438693. The next prime is 28438703. The reversal of 28438700 is 783482.

It is not an unprimeable number, because it can be changed into a prime (28438703) by changing a digit.

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, 142094 + ... + 142293.

Almost surely, 2^28438700 is an apocalyptic number.

28438700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28438700 is an abundant number, since it is smaller than the sum of its proper divisors (33273496).

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

28438700 is a wasteful number, since it uses less digits than its factorization.

28438700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284401 (or 284394 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28438700 is about 5332.7947644739. The cubic root of 28438700 is about 305.2365807535.

The spelling of 28438700 in words is "twenty-eight million, four hundred thirty-eight thousand, seven hundred".