28553616 has 120 divisors (see below), whose sum is σ = 98396480. Its totient is φ = 7527168.

The previous prime is 28553611. The next prime is 28553617. The reversal of 28553616 is 61635582.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28553611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12015 + ... + 14193.

Almost surely, 2^28553616 is an apocalyptic number.

28553616 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 28553616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49198240).

28553616 is an abundant number, since it is smaller than the sum of its proper divisors (69842864).

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

28553616 is a wasteful number, since it uses less digits than its factorization.

28553616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213 (or 2204 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 28553616 is about 5343.5583649849. The cubic root of 28553616 is about 305.6471647643.

The spelling of 28553616 in words is "twenty-eight million, five hundred fifty-three thousand, six hundred sixteen".