28636140 has 48 divisors (see below), whose sum is σ = 86351328. Its totient is φ = 7048704.

The previous prime is 28636129. The next prime is 28636169. The reversal of 28636140 is 4163682.

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 = 28636098 and 28636107.

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, 17577 + ... + 19136.

It is an arithmetic number, because the mean of its divisors is an integer number (1798986).

Almost surely, 2^28636140 is an apocalyptic number.

28636140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28636140 is an abundant number, since it is smaller than the sum of its proper divisors (57715188).

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

28636140 is a wasteful number, since it uses less digits than its factorization.

28636140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36738 (or 36736 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28636140 is about 5351.2746145194. The cubic root of 28636140 is about 305.9413360992.

The spelling of 28636140 in words is "twenty-eight million, six hundred thirty-six thousand, one hundred forty".