28015776 has 72 divisors (see below), whose sum is σ = 80638740. Its totient is φ = 9225216.

The previous prime is 28015717. The next prime is 28015777. The reversal of 28015776 is 67751082.

28015776 is a `hidden beast` number, since 2 + 80 + 1 + 577 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27248400 + 767376 = 5220^2 + 876^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28015776.

It is not an unprimeable number, because it can be changed into a prime (28015777) 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 11 ways as a sum of consecutive naturals, for example, 25086 + ... + 26178.

Almost surely, 2^28015776 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 28015776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40319370).

28015776 is an abundant number, since it is smaller than the sum of its proper divisors (52622964).

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

28015776 is a wasteful number, since it uses less digits than its factorization.

28015776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28015776 is about 5292.9931040953. The cubic root of 28015776 is about 303.7159165130.

The spelling of 28015776 in words is "twenty-eight million, fifteen thousand, seven hundred seventy-six".