213987087 has 12 divisors (see below), whose sum is σ = 309361104. Its totient is φ = 142534080.

The previous prime is 213987073. The next prime is 213987089. The reversal of 213987087 is 780789312.

213987087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213987087 - 2⁷ = 213986959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213987089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1287 + ... + 20727.

It is an arithmetic number, because the mean of its divisors is an integer number (25780092).

Almost surely, 2^213987087 is an apocalyptic number.

213987087 is a deficient number, since it is larger than the sum of its proper divisors (95374017).

213987087 is a wasteful number, since it uses less digits than its factorization.

213987087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20670 (or 20667 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 213987087 is about 14628.2974744158. The cubic root of 213987087 is about 598.1303718690.

The spelling of 213987087 in words is "two hundred thirteen million, nine hundred eighty-seven thousand, eighty-seven".