28051398 has 24 divisors (see below), whose sum is σ = 63421488. Its totient is φ = 8943792.

The previous prime is 28051369. The next prime is 28051403. The reversal of 28051398 is 89315082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33465 + ... + 34292.

It is an arithmetic number, because the mean of its divisors is an integer number (2642562).

Almost surely, 2^28051398 is an apocalyptic number.

28051398 is an abundant number, since it is smaller than the sum of its proper divisors (35370090).

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

28051398 is a wasteful number, since it uses less digits than its factorization.

28051398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67788 (or 67785 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28051398 is about 5296.3570498976. The cubic root of 28051398 is about 303.8445867092.

The spelling of 28051398 in words is "twenty-eight million, fifty-one thousand, three hundred ninety-eight".