22277987 has 4 divisors (see below), whose sum is σ = 22655640. Its totient is φ = 21900336.

The previous prime is 22277971. The next prime is 22277989. The reversal of 22277987 is 78977222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22277987 - 2⁴ = 22277971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22277989) 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, 188738 + ... + 188855.

It is an arithmetic number, because the mean of its divisors is an integer number (5663910).

Almost surely, 2^22277987 is an apocalyptic number.

22277987 is a deficient number, since it is larger than the sum of its proper divisors (377653).

22277987 is an equidigital number, since it uses as much as digits as its factorization.

22277987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377652.

The product of its digits is 197568, while the sum is 44.

The square root of 22277987 is about 4719.9562497972. The cubic root of 22277987 is about 281.3791945044.

The spelling of 22277987 in words is "twenty-two million, two hundred seventy-seven thousand, nine hundred eighty-seven".