28415560 has 16 divisors (see below), whose sum is σ = 63935100. Its totient is φ = 11366208.

The previous prime is 28415539. The next prime is 28415617. The reversal of 28415560 is 6551482.

It can be written as a sum of positive squares in 2 ways, for example, as 28366276 + 49284 = 5326^2 + 222^2 .

It is a super-2 number, since 2×28415560² = 1614888100227200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355155 + ... + 355234.

Almost surely, 2^28415560 is an apocalyptic number.

28415560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28415560 is an abundant number, since it is smaller than the sum of its proper divisors (35519540).

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

28415560 is a wasteful number, since it uses less digits than its factorization.

28415560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710400 (or 710396 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28415560 is about 5330.6247288662. The cubic root of 28415560 is about 305.1537699937.

The spelling of 28415560 in words is "twenty-eight million, four hundred fifteen thousand, five hundred sixty".