28771560 has 96 divisors (see below), whose sum is σ = 94185000. Its totient is φ = 7617024.

The previous prime is 28771559. The next prime is 28771573. The reversal of 28771560 is 6517782.

28771560 is a `hidden beast` number, since 28 + 7 + 71 + 560 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 28579716 + 191844 = 5346^2 + 438^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82266 + ... + 82614.

Almost surely, 2^28771560 is an apocalyptic number.

28771560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28771560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47092500).

28771560 is an abundant number, since it is smaller than the sum of its proper divisors (65413440).

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

28771560 is a wasteful number, since it uses less digits than its factorization.

28771560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 588 counting only the distinct ones).

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

The square root of 28771560 is about 5363.9127509683. The cubic root of 28771560 is about 306.4228423185.

The spelling of 28771560 in words is "twenty-eight million, seven hundred seventy-one thousand, five hundred sixty".