28569960 has 96 divisors (see below), whose sum is σ = 94447080. Its totient is φ = 7488000.

The previous prime is 28569943. The next prime is 28569973. The reversal of 28569960 is 6996582.

28569960 is a `hidden beast` number, since 28 + 569 + 9 + 60 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5008644 + 23561316 = 2238^2 + 4854^2 .

It is a super-2 number, since 2×28569960² = 1632485228803200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 21310 + ... + 22610.

Almost surely, 2^28569960 is an apocalyptic number.

28569960 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 28569960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47223540).

28569960 is an abundant number, since it is smaller than the sum of its proper divisors (65877120).

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

28569960 is a wasteful number, since it uses less digits than its factorization.

28569960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 28569960 is about 5345.0874642049. The cubic root of 28569960 is about 305.7054707997.

The spelling of 28569960 in words is "twenty-eight million, five hundred sixty-nine thousand, nine hundred sixty".