28742208 has 112 divisors (see below), whose sum is σ = 85831680. Its totient is φ = 8409600.

The previous prime is 28742201. The next prime is 28742213. The reversal of 28742208 is 80224782.

It is a super-2 number, since 2×28742208² = 1652229041430528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28742201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65253 + ... + 65691.

Almost surely, 2^28742208 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 28742208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42915840).

28742208 is an abundant number, since it is smaller than the sum of its proper divisors (57089472).

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

28742208 is a wasteful number, since it uses less digits than its factorization.

28742208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28742208 is about 5361.1759903961. The cubic root of 28742208 is about 306.3186053159.

The spelling of 28742208 in words is "twenty-eight million, seven hundred forty-two thousand, two hundred eight".