28107680 has 24 divisors (see below), whose sum is σ = 66404772. Its totient is φ = 11243008.

The previous prime is 28107661. The next prime is 28107683. The reversal of 28107680 is 8670182.

It can be written as a sum of positive squares in 2 ways, for example, as 27583504 + 524176 = 5252^2 + 724^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (28107683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87677 + ... + 87996.

Almost surely, 2^28107680 is an apocalyptic number.

28107680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28107680 is an abundant number, since it is smaller than the sum of its proper divisors (38297092).

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

28107680 is a wasteful number, since it uses less digits than its factorization.

28107680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175688 (or 175680 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 28107680 is about 5301.6676621607. The cubic root of 28107680 is about 304.0476610407.

The spelling of 28107680 in words is "twenty-eight million, one hundred seven thousand, six hundred eighty".