28915860 has 48 divisors (see below), whose sum is σ = 82184256. Its totient is φ = 7594752.

The previous prime is 28915849. The next prime is 28915867. The reversal of 28915860 is 6851982.

It is a super-2 number, since 2×28915860² = 1672253919079200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28915867) 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, 424 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (1712172).

Almost surely, 2^28915860 is an apocalyptic number.

28915860 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 28915860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41092128).

28915860 is an abundant number, since it is smaller than the sum of its proper divisors (53268396).

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

28915860 is a wasteful number, since it uses less digits than its factorization.

28915860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7272 (or 7270 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28915860 is about 5377.3469294811. The cubic root of 28915860 is about 306.9342628580.

The spelling of 28915860 in words is "twenty-eight million, nine hundred fifteen thousand, eight hundred sixty".