2187993764 has 24 divisors (see below), whose sum is σ = 4311826176. Its totient is φ = 962460000.

The previous prime is 2187993763. The next prime is 2187993767. The reversal of 2187993764 is 4673997812.

It is a super-2 number, since 2×2187993764² = 9574633422605775392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2187993761) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 800687 + ... + 803414.

It is an arithmetic number, because the mean of its divisors is an integer number (179659424).

Almost surely, 2^2187993764 is an apocalyptic number.

It is an amenable number.

2187993764 is a deficient number, since it is larger than the sum of its proper divisors (2123832412).

2187993764 is a wasteful number, since it uses less digits than its factorization.

2187993764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604147 (or 1604145 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 56.

The square root of 2187993764 is about 46775.9955960319. The cubic root of 2187993764 is about 1298.2211892257.

The spelling of 2187993764 in words is "two billion, one hundred eighty-seven million, nine hundred ninety-three thousand, seven hundred sixty-four".