28478580 has 96 divisors (see below), whose sum is σ = 88905600. Its totient is φ = 6763008.

The previous prime is 28478563. The next prime is 28478591. The reversal of 28478580 is 8587482.

It is a super-2 number, since 2×28478580² = 1622059037632800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21991 + ... + 23249.

It is an arithmetic number, because the mean of its divisors is an integer number (926100).

Almost surely, 2^28478580 is an apocalyptic number.

28478580 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 28478580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44452800).

28478580 is an abundant number, since it is smaller than the sum of its proper divisors (60427020).

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

28478580 is a wasteful number, since it uses less digits than its factorization.

28478580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 28478580 is about 5336.5325821173. The cubic root of 28478580 is about 305.3791933345.

The spelling of 28478580 in words is "twenty-eight million, four hundred seventy-eight thousand, five hundred eighty".