28068444 has 72 divisors (see below), whose sum is σ = 74850048. Its totient is φ = 9195120.

The previous prime is 28068431. The next prime is 28068457. The reversal of 28068444 is 44486082.

It is an interprime number because it is at equal distance from previous prime (28068431) and next prime (28068457).

It is a super-2 number, since 2×28068444² = 1575675097162272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28068399 and 28068408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64909 + ... + 65339.

It is an arithmetic number, because the mean of its divisors is an integer number (1039584).

Almost surely, 2^28068444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28068444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37425024).

28068444 is an abundant number, since it is smaller than the sum of its proper divisors (46781604).

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

28068444 is a wasteful number, since it uses less digits than its factorization.

28068444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28068444 is about 5297.9660248061. The cubic root of 28068444 is about 303.9061200188.

The spelling of 28068444 in words is "twenty-eight million, sixty-eight thousand, four hundred forty-four".