28397616 has 80 divisors (see below), whose sum is σ = 83682144. Its totient is φ = 8220672.

The previous prime is 28397597. The next prime is 28397627. The reversal of 28397616 is 61679382.

It is a happy number.

It is a congruent number.

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, 9270 + ... + 11946.

Almost surely, 2^28397616 is an apocalyptic number.

28397616 is a gapful number since it is divisible by the number (26) 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 28397616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41841072).

28397616 is an abundant number, since it is smaller than the sum of its proper divisors (55284528).

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

28397616 is a wasteful number, since it uses less digits than its factorization.

28397616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718 (or 2712 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 28397616 is about 5328.9413582812. The cubic root of 28397616 is about 305.0895231250.

The spelling of 28397616 in words is "twenty-eight million, three hundred ninety-seven thousand, six hundred sixteen".