28077987 has 32 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 15586560.

The previous prime is 28077979. The next prime is 28078019. The reversal of 28077987 is 78977082.

It is not a de Polignac number, because 28077987 - 2³ = 28077979 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28077937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155037 + ... + 155217.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^28077987 is an apocalyptic number.

28077987 is a deficient number, since it is larger than the sum of its proper divisors (15951453).

28077987 is a wasteful number, since it uses less digits than its factorization.

28077987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363.

The product of its (nonzero) digits is 395136, while the sum is 48.

The square root of 28077987 is about 5298.8665769200. The cubic root of 28077987 is about 303.9405578319.

The spelling of 28077987 in words is "twenty-eight million, seventy-seven thousand, nine hundred eighty-seven".