220755987 has 6 divisors (see below), whose sum is σ = 318869772. Its totient is φ = 147170652.

The previous prime is 220755967. The next prime is 220755989. The reversal of 220755987 is 789557022.

It is a happy number.

It is not a de Polignac number, because 220755987 - 2⁶ = 220755923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220755989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12264213 + ... + 12264230.

It is an arithmetic number, because the mean of its divisors is an integer number (53144962).

Almost surely, 2^220755987 is an apocalyptic number.

220755987 is a deficient number, since it is larger than the sum of its proper divisors (98113785).

220755987 is a wasteful number, since it uses less digits than its factorization.

220755987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24528449 (or 24528446 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 220755987 is about 14857.8594353292. The cubic root of 220755987 is about 604.3717604853.

The spelling of 220755987 in words is "two hundred twenty million, seven hundred fifty-five thousand, nine hundred eighty-seven".