28807776 has 72 divisors (see below), whose sum is σ = 85503600. Its totient is φ = 9182976.

The previous prime is 28807763. The next prime is 28807783. The reversal of 28807776 is 67770882.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4450 + ... + 8798.

It is an arithmetic number, because the mean of its divisors is an integer number (1187550).

Almost surely, 2^28807776 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 28807776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42751800).

28807776 is an abundant number, since it is smaller than the sum of its proper divisors (56695824).

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

28807776 is a wasteful number, since it uses less digits than its factorization.

28807776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388 (or 4377 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 28807776 is about 5367.2875831280. The cubic root of 28807776 is about 306.5513576145.

The spelling of 28807776 in words is "twenty-eight million, eight hundred seven thousand, seven hundred seventy-six".