28727916 has 36 divisors (see below), whose sum is σ = 77977368. Its totient is φ = 8207808.

The previous prime is 28727911. The next prime is 28727927. The reversal of 28727916 is 61972782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28727911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23841 + ... + 25016.

It is an arithmetic number, because the mean of its divisors is an integer number (2166038).

Almost surely, 2^28727916 is an apocalyptic number.

It is an amenable number.

28727916 is an abundant number, since it is smaller than the sum of its proper divisors (49249452).

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

28727916 is a wasteful number, since it uses less digits than its factorization.

28727916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48878 (or 48869 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 28727916 is about 5359.8429081457. The cubic root of 28727916 is about 306.2678248129.

It can be divided in two parts, 287 and 27916, that added together give a triangular number (28203 = T₂₃₇).

The spelling of 28727916 in words is "twenty-eight million, seven hundred twenty-seven thousand, nine hundred sixteen".