28351580 has 48 divisors (see below), whose sum is σ = 64120896. Its totient is φ = 10490880.

The previous prime is 28351567. The next prime is 28351613. The reversal of 28351580 is 8515382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20057 + ... + 21423.

It is an arithmetic number, because the mean of its divisors is an integer number (1335852).

Almost surely, 2^28351580 is an apocalyptic number.

28351580 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 28351580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32060448).

28351580 is an abundant number, since it is smaller than the sum of its proper divisors (35769316).

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

28351580 is a wasteful number, since it uses less digits than its factorization.

28351580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454 (or 1452 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 28351580 is about 5324.6201742472. The cubic root of 28351580 is about 304.9245715115.

The spelling of 28351580 in words is "twenty-eight million, three hundred fifty-one thousand, five hundred eighty".