28815774 has 32 divisors (see below), whose sum is σ = 62826624. Its totient is φ = 8757600.

The previous prime is 28815767. The next prime is 28815779. The reversal of 28815774 is 47751882.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4249 + ... + 8699.

It is an arithmetic number, because the mean of its divisors is an integer number (1963332).

Almost surely, 2^28815774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28815774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31413312).

28815774 is an abundant number, since it is smaller than the sum of its proper divisors (34010850).

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

28815774 is a wasteful number, since it uses less digits than its factorization.

28815774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4552.

The product of its digits is 125440, while the sum is 42.

The square root of 28815774 is about 5368.0326004971. The cubic root of 28815774 is about 306.5797246185.

The spelling of 28815774 in words is "twenty-eight million, eight hundred fifteen thousand, seven hundred seventy-four".