28536240 has 40 divisors (see below), whose sum is σ = 88463088. Its totient is φ = 7609600.

The previous prime is 28536223. The next prime is 28536241. The reversal of 28536240 is 4263582.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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 = 28536198 and 28536207.

It is not an unprimeable number, because it can be changed into a prime (28536241) 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, 59211 + ... + 59690.

Almost surely, 2^28536240 is an apocalyptic number.

28536240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28536240 is an abundant number, since it is smaller than the sum of its proper divisors (59926848).

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

28536240 is a wasteful number, since it uses less digits than its factorization.

28536240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118917 (or 118911 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 28536240 is about 5341.9322346881. The cubic root of 28536240 is about 305.5851527376.

The spelling of 28536240 in words is "twenty-eight million, five hundred thirty-six thousand, two hundred forty".