28077568 has 80 divisors (see below), whose sum is σ = 60888960. Its totient is φ = 12902400.

The previous prime is 28077563. The next prime is 28077571. The reversal of 28077568 is 86577082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460258 + ... + 460318.

It is an arithmetic number, because the mean of its divisors is an integer number (761112).

Almost surely, 2^28077568 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 28077568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30444480).

28077568 is an abundant number, since it is smaller than the sum of its proper divisors (32811392).

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

28077568 is an equidigital number, since it uses as much as digits as its factorization.

28077568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28077568 is about 5298.8270400156. The cubic root of 28077568 is about 303.9390459509.

The spelling of 28077568 in words is "twenty-eight million, seventy-seven thousand, five hundred sixty-eight".