28069440 has 112 divisors (see below), whose sum is σ = 101876352. Its totient is φ = 6414336.

The previous prime is 28069439. The next prime is 28069451. The reversal of 28069440 is 4496082.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4632 + ... + 8808.

Almost surely, 2^28069440 is an apocalyptic number.

28069440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50938176).

28069440 is an abundant number, since it is smaller than the sum of its proper divisors (73806912).

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

28069440 is a wasteful number, since it uses less digits than its factorization.

28069440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4204 (or 4194 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 28069440 is about 5298.0600223101. The cubic root of 28069440 is about 303.9097146476.

It can be divided in two parts, 2806 and 9440, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 28069440 in words is "twenty-eight million, sixty-nine thousand, four hundred forty".