28623580 has 48 divisors (see below), whose sum is σ = 65862720. Its totient is φ = 10400768.

The previous prime is 28623541. The next prime is 28623583. The reversal of 28623580 is 8532682.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28623583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8409 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^28623580 is an apocalyptic number.

28623580 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 28623580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32931360).

28623580 is an abundant number, since it is smaller than the sum of its proper divisors (37239140).

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

28623580 is a wasteful number, since it uses less digits than its factorization.

28623580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958 (or 2956 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28623580 is about 5350.1009336273. The cubic root of 28623580 is about 305.8966002617.

The spelling of 28623580 in words is "twenty-eight million, six hundred twenty-three thousand, five hundred eighty".