2156887788 has 48 divisors (see below), whose sum is σ = 5593867776. Its totient is φ = 641268160.

The previous prime is 2156887781. The next prime is 2156887807. The reversal of 2156887788 is 8877886512.

It is not an unprimeable number, because it can be changed into a prime (2156887781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147156 + ... + 161147.

It is an arithmetic number, because the mean of its divisors is an integer number (116538912).

Almost surely, 2^2156887788 is an apocalyptic number.

It is an amenable number.

2156887788 is an abundant number, since it is smaller than the sum of its proper divisors (3436979988).

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

2156887788 is a wasteful number, since it uses less digits than its factorization.

2156887788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308374 (or 308372 counting only the distinct ones).

The product of its digits is 12042240, while the sum is 60.

The square root of 2156887788 is about 46442.3060150979. The cubic root of 2156887788 is about 1292.0396769471.

The spelling of 2156887788 in words is "two billion, one hundred fifty-six million, eight hundred eighty-seven thousand, seven hundred eighty-eight".