28716240 has 80 divisors (see below), whose sum is σ = 101743488. Its totient is φ = 6563328.

The previous prime is 28716227. The next prime is 28716241. The reversal of 28716240 is 4261782.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 28716198 and 28716207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28716241) 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, 6867 + ... + 10226.

Almost surely, 2^28716240 is an apocalyptic number.

28716240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28716240 is an abundant number, since it is smaller than the sum of its proper divisors (73027248).

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

28716240 is a wasteful number, since it uses less digits than its factorization.

28716240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17116 (or 17110 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28716240 is about 5358.7535864229. The cubic root of 28716240 is about 306.2263266443.

The spelling of 28716240 in words is "twenty-eight million, seven hundred sixteen thousand, two hundred forty".