28681580 has 24 divisors (see below), whose sum is σ = 62309520. Its totient is φ = 11076800.

The previous prime is 28681579. The next prime is 28681589. The reversal of 28681580 is 8518682.

It is not an unprimeable number, because it can be changed into a prime (28681589) 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, 24146 + ... + 25305.

It is an arithmetic number, because the mean of its divisors is an integer number (2596230).

Almost surely, 2^28681580 is an apocalyptic number.

28681580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28681580 is an abundant number, since it is smaller than the sum of its proper divisors (33627940).

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

28681580 is a wasteful number, since it uses less digits than its factorization.

28681580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49489 (or 49487 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28681580 is about 5355.5186490199. The cubic root of 28681580 is about 306.1030737675.

The spelling of 28681580 in words is "twenty-eight million, six hundred eighty-one thousand, five hundred eighty".