28545240 has 32 divisors (see below), whose sum is σ = 85636080. Its totient is φ = 7612032.

The previous prime is 28545233. The next prime is 28545259. The reversal of 28545240 is 4254582.

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

It is a junction number, because it is equal to n+sod(n) for n = 28545198 and 28545207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118819 + ... + 119058.

Almost surely, 2^28545240 is an apocalyptic number.

28545240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28545240 is an abundant number, since it is smaller than the sum of its proper divisors (57090840).

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

28545240 is a wasteful number, since it uses less digits than its factorization.

28545240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237891 (or 237887 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 28545240 is about 5342.7745600952. The cubic root of 28545240 is about 305.6172753682.

The spelling of 28545240 in words is "twenty-eight million, five hundred forty-five thousand, two hundred forty".