28540446 has 32 divisors (see below), whose sum is σ = 62764416. Its totient is φ = 8580000.

The previous prime is 28540441. The next prime is 28540507. The reversal of 28540446 is 64404582.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540441) 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, 6996 + ... + 10296.

It is an arithmetic number, because the mean of its divisors is an integer number (1961388).

Almost surely, 2^28540446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28540446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31382208).

28540446 is an abundant number, since it is smaller than the sum of its proper divisors (34223970).

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

28540446 is a wasteful number, since it uses less digits than its factorization.

28540446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3448.

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 28540446 is about 5342.3258979587. The cubic root of 28540446 is about 305.6001655541.

The spelling of 28540446 in words is "twenty-eight million, five hundred forty thousand, four hundred forty-six".