1216686588 has 48 divisors (see below), whose sum is σ = 3079685280. Its totient is φ = 371625984.

The previous prime is 1216686571. The next prime is 1216686589. The reversal of 1216686588 is 8856866121.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1216686588.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216686589) 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, 7093 + ... + 49836.

It is an arithmetic number, because the mean of its divisors is an integer number (64160110).

Almost surely, 2^1216686588 is an apocalyptic number.

It is an amenable number.

1216686588 is an abundant number, since it is smaller than the sum of its proper divisors (1862998692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216686588 is a wasteful number, since it uses less digits than its factorization.

1216686588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57086 (or 57084 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 51.

The square root of 1216686588 is about 34881.0347896962. The cubic root of 1216686588 is about 1067.5615090329.

The spelling of 1216686588 in words is "one billion, two hundred sixteen million, six hundred eighty-six thousand, five hundred eighty-eight".