28145320 has 32 divisors (see below), whose sum is σ = 72374400. Its totient is φ = 9649728.

The previous prime is 28145309. The next prime is 28145321. The reversal of 28145320 is 2354182.

It is not an unprimeable number, because it can be changed into a prime (28145321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49980 + ... + 50539.

It is an arithmetic number, because the mean of its divisors is an integer number (2261700).

Almost surely, 2^28145320 is an apocalyptic number.

28145320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28145320 is an abundant number, since it is smaller than the sum of its proper divisors (44229080).

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

28145320 is a wasteful number, since it uses less digits than its factorization.

28145320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100537 (or 100533 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28145320 is about 5305.2163009627. The cubic root of 28145320 is about 304.1833208704.

The spelling of 28145320 in words is "twenty-eight million, one hundred forty-five thousand, three hundred twenty".