28742868 has 72 divisors (see below), whose sum is σ = 90592320. Its totient is φ = 7464960.

The previous prime is 28742867. The next prime is 28742873. The reversal of 28742868 is 86824782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2413 + ... + 7956.

Almost surely, 2^28742868 is an apocalyptic number.

28742868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28742868 is an abundant number, since it is smaller than the sum of its proper divisors (61849452).

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

28742868 is a wasteful number, since it uses less digits than its factorization.

28742868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10397 (or 10392 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28742868 is about 5361.2375437020. The cubic root of 28742868 is about 306.3209499366.

It can be divided in two parts, 287428 and 68, that added together give a cube (287496 = 66³).

The spelling of 28742868 in words is "twenty-eight million, seven hundred forty-two thousand, eight hundred sixty-eight".