28503660 has 48 divisors (see below), whose sum is σ = 80946432. Its totient is φ = 7492800.

The previous prime is 28503649. The next prime is 28503661. The reversal of 28503660 is 6630582.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28503661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (1686384).

Almost surely, 2^28503660 is an apocalyptic number.

28503660 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 28503660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40473216).

28503660 is an abundant number, since it is smaller than the sum of its proper divisors (52442772).

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

28503660 is a wasteful number, since it uses less digits than its factorization.

28503660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6774 (or 6772 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 28503660 is about 5338.8819054180. The cubic root of 28503660 is about 305.4688123039.

The spelling of 28503660 in words is "twenty-eight million, five hundred three thousand, six hundred sixty".