28540416 has 80 divisors (see below), whose sum is σ = 80579664. Its totient is φ = 8945664.

The previous prime is 28540411. The next prime is 28540417. The reversal of 28540416 is 61404582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540411) 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, 25566 + ... + 26658.

Almost surely, 2^28540416 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 28540416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40289832).

28540416 is an abundant number, since it is smaller than the sum of its proper divisors (52039248).

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

28540416 is a wasteful number, since it uses less digits than its factorization.

28540416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28540416 is about 5342.3230901921. The cubic root of 28540416 is about 305.6000584779.

Adding to 28540416 its reverse (61404582), we get a palindrome (89944998).

The spelling of 28540416 in words is "twenty-eight million, five hundred forty thousand, four hundred sixteen".