28351680 has 112 divisors (see below), whose sum is σ = 102900480. Its totient is φ = 6478848.

The previous prime is 28351643. The next prime is 28351703. The reversal of 28351680 is 8615382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 4611 + ... + 8829.

Almost surely, 2^28351680 is an apocalyptic number.

28351680 is a gapful number since it is divisible by the number (20) 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 28351680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51450240).

28351680 is an abundant number, since it is smaller than the sum of its proper divisors (74548800).

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

28351680 is a wasteful number, since it uses less digits than its factorization.

28351680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246 (or 4236 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28351680 is about 5324.6295645801. The cubic root of 28351680 is about 304.9249300150.

The spelling of 28351680 in words is "twenty-eight million, three hundred fifty-one thousand, six hundred eighty".