218772087 has 16 divisors (see below), whose sum is σ = 296732160. Its totient is φ = 143343200.

The previous prime is 218772077. The next prime is 218772091. The reversal of 218772087 is 780277812.

218772087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 218772087 - 2¹⁴ = 218755703 is a prime.

It is a super-2 number, since 2×218772087² = 95722452100671138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218772077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75037 + ... + 77897.

It is an arithmetic number, because the mean of its divisors is an integer number (18545760).

Almost surely, 2^218772087 is an apocalyptic number.

218772087 is a deficient number, since it is larger than the sum of its proper divisors (77960073).

218772087 is a wasteful number, since it uses less digits than its factorization.

218772087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294.

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 218772087 is about 14790.9461157831. The cubic root of 218772087 is about 602.5558445279. Note that the first 3 decimals are identical.

The spelling of 218772087 in words is "two hundred eighteen million, seven hundred seventy-two thousand, eighty-seven".