28409696 has 48 divisors (see below), whose sum is σ = 65155104. Its totient is φ = 11940864.

The previous prime is 28409687. The next prime is 28409699. The reversal of 28409696 is 69690482.

It is a super-2 number, since 2×28409696² = 1614221653624832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28409699) 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, 10676 + ... + 13068.

It is an arithmetic number, because the mean of its divisors is an integer number (1357398).

Almost surely, 2^28409696 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 28409696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32577552).

28409696 is an abundant number, since it is smaller than the sum of its proper divisors (36745408).

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

28409696 is a wasteful number, since it uses less digits than its factorization.

28409696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463 (or 2455 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 28409696 is about 5330.0746711467. The cubic root of 28409696 is about 305.1327774482.

The spelling of 28409696 in words is "twenty-eight million, four hundred nine thousand, six hundred ninety-six".