28469440 has 56 divisors (see below), whose sum is σ = 69402960. Its totient is φ = 11117568.

The previous prime is 28469431. The next prime is 28469443. The reversal of 28469440 is 4496482.

It is a self number, because there is not a number n which added to its sum of digits gives 28469440.

It is not an unprimeable number, because it can be changed into a prime (28469443) 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, 12726 + ... + 14794.

Almost surely, 2^28469440 is an apocalyptic number.

28469440 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 28469440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34701480).

28469440 is an abundant number, since it is smaller than the sum of its proper divisors (40933520).

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

28469440 is a wasteful number, since it uses less digits than its factorization.

28469440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129 (or 2119 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 28469440 is about 5335.6761520917. The cubic root of 28469440 is about 305.3465200706.

The spelling of 28469440 in words is "twenty-eight million, four hundred sixty-nine thousand, four hundred forty".