213487888 has 20 divisors (see below), whose sum is σ = 414264780. Its totient is φ = 106580864.

The previous prime is 213487873. The next prime is 213487907. The reversal of 213487888 is 888784312.

It can be written as a sum of positive squares in 2 ways, for example, as 177102864 + 36385024 = 13308^2 + 6032^2 .

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978 + ... + 20686.

It is an arithmetic number, because the mean of its divisors is an integer number (20713239).

Almost surely, 2^213487888 is an apocalyptic number.

It is an amenable number.

213487888 is a deficient number, since it is larger than the sum of its proper divisors (200776892).

213487888 is a wasteful number, since it uses less digits than its factorization.

213487888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20394 (or 20388 counting only the distinct ones).

The product of its digits is 688128, while the sum is 49.

The square root of 213487888 is about 14611.2247262165. The cubic root of 213487888 is about 597.6648942955.

The spelling of 213487888 in words is "two hundred thirteen million, four hundred eighty-seven thousand, eight hundred eighty-eight".