28499968 has 84 divisors (see below), whose sum is σ = 67235832. Its totient is φ = 12042240.

The previous prime is 28499963. The next prime is 28499969. The reversal of 28499968 is 86999482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28499963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 401373 + ... + 401443.

Almost surely, 2^28499968 is an apocalyptic number.

28499968 is a gapful number since it is divisible by the number (28) 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 28499968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33617916).

28499968 is an abundant number, since it is smaller than the sum of its proper divisors (38735864).

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

28499968 is an frugal number, since it uses more digits than its factorization.

28499968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 80 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 28499968 is about 5338.5361289402. The cubic root of 28499968 is about 305.4556228918.

The spelling of 28499968 in words is "twenty-eight million, four hundred ninety-nine thousand, nine hundred sixty-eight".