28771986 has 8 divisors (see below), whose sum is σ = 57543984. Its totient is φ = 9590660.

The previous prime is 28771961. The next prime is 28771987. The reversal of 28771986 is 68917782.

It is a sphenic number, since it is the product of 3 distinct primes.

28771986 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28771987) 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, 2397660 + ... + 2397671.

It is an arithmetic number, because the mean of its divisors is an integer number (7192998).

Almost surely, 2^28771986 is an apocalyptic number.

28771986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28771986 is a wasteful number, since it uses less digits than its factorization.

28771986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795336.

The product of its digits is 338688, while the sum is 48.

The square root of 28771986 is about 5363.9524606394. The cubic root of 28771986 is about 306.4243546393.

The spelling of 28771986 in words is "twenty-eight million, seven hundred seventy-one thousand, nine hundred eighty-six".