28747768 has 16 divisors (see below), whose sum is σ = 61602480. Its totient is φ = 12320448.

The previous prime is 28747759. The next prime is 28747781. The reversal of 28747768 is 86774782.

It is a happy number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256621 + ... + 256732.

It is an arithmetic number, because the mean of its divisors is an integer number (3850155).

Almost surely, 2^28747768 is an apocalyptic number.

28747768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28747768 is an abundant number, since it is smaller than the sum of its proper divisors (32854712).

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

28747768 is a wasteful number, since it uses less digits than its factorization.

28747768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513366 (or 513362 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 49.

The square root of 28747768 is about 5361.6945082688. The cubic root of 28747768 is about 306.3383558472.

The spelling of 28747768 in words is "twenty-eight million, seven hundred forty-seven thousand, seven hundred sixty-eight".