28727898 has 16 divisors (see below), whose sum is σ = 57620160. Its totient is φ = 9548576.

The previous prime is 28727887. The next prime is 28727899. The reversal of 28727898 is 89872782.

It is a happy number.

28727898 is a modest number, since divided by 7898 gives 2872 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 28727898.

It is not an unprimeable number, because it can be changed into a prime (28727899) 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, 4515 + ... + 8822.

It is an arithmetic number, because the mean of its divisors is an integer number (3601260).

Almost surely, 2^28727898 is an apocalyptic number.

28727898 is an abundant number, since it is smaller than the sum of its proper divisors (28892262).

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

28727898 is a wasteful number, since it uses less digits than its factorization.

28727898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13701.

The product of its digits is 903168, while the sum is 51.

The square root of 28727898 is about 5359.8412289918. The cubic root of 28727898 is about 306.2677608469.

The spelling of 28727898 in words is "twenty-eight million, seven hundred twenty-seven thousand, eight hundred ninety-eight".