2167987636 has 48 divisors (see below), whose sum is σ = 4016557440. Its totient is φ = 1021870080.

The previous prime is 2167987621. The next prime is 2167987649. The reversal of 2167987636 is 6367897612.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381876 + ... + 3382516.

It is an arithmetic number, because the mean of its divisors is an integer number (83678280).

Almost surely, 2^2167987636 is an apocalyptic number.

It is an amenable number.

2167987636 is a deficient number, since it is larger than the sum of its proper divisors (1848569804).

2167987636 is a wasteful number, since it uses less digits than its factorization.

2167987636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144 (or 1142 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 55.

The square root of 2167987636 is about 46561.6541372834. The cubic root of 2167987636 is about 1294.2522650299.

The spelling of 2167987636 in words is "two billion, one hundred sixty-seven million, nine hundred eighty-seven thousand, six hundred thirty-six".