2187408868 has 24 divisors (see below), whose sum is σ = 3962218680. Its totient is φ = 1055389440.

The previous prime is 2187408857. The next prime is 2187408869. The reversal of 2187408868 is 8688047812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1010095524 + 1177313344 = 31782^2 + 34312^2 .

It is not an unprimeable number, because it can be changed into a prime (2187408869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252448 + ... + 260968.

It is an arithmetic number, because the mean of its divisors is an integer number (165092445).

Almost surely, 2^2187408868 is an apocalyptic number.

It is an amenable number.

2187408868 is a deficient number, since it is larger than the sum of its proper divisors (1774809812).

2187408868 is a wasteful number, since it uses less digits than its factorization.

2187408868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10767 (or 10765 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 52.

The square root of 2187408868 is about 46769.7430824673. The cubic root of 2187408868 is about 1298.1054984554.

The spelling of 2187408868 in words is "two billion, one hundred eighty-seven million, four hundred eight thousand, eight hundred sixty-eight".