28821726 has 12 divisors (see below), whose sum is σ = 62447112. Its totient is φ = 9607236.

The previous prime is 28821721. The next prime is 28821743. The reversal of 28821726 is 62712882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28821721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800586 + ... + 800621.

It is an arithmetic number, because the mean of its divisors is an integer number (5203926).

Almost surely, 2^28821726 is an apocalyptic number.

28821726 is an abundant number, since it is smaller than the sum of its proper divisors (33625386).

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

28821726 is a wasteful number, since it uses less digits than its factorization.

28821726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601215 (or 1601212 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28821726 is about 5368.5869649285. The cubic root of 28821726 is about 306.6008315407.

The spelling of 28821726 in words is "twenty-eight million, eight hundred twenty-one thousand, seven hundred twenty-six".