2155278830 has 16 divisors (see below), whose sum is σ = 3893512320. Its totient is φ = 858998112.

The previous prime is 2155278821. The next prime is 2155278833. The reversal of 2155278830 is 388725512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155278833) 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 7 ways as a sum of consecutive naturals, for example, 386270 + ... + 391809.

It is an arithmetic number, because the mean of its divisors is an integer number (243344520).

Almost surely, 2^2155278830 is an apocalyptic number.

2155278830 is a deficient number, since it is larger than the sum of its proper divisors (1738233490).

2155278830 is a wasteful number, since it uses less digits than its factorization.

2155278830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778363.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 2155278830 is about 46424.9806677396. The cubic root of 2155278830 is about 1291.7183258608.

The spelling of 2155278830 in words is "two billion, one hundred fifty-five million, two hundred seventy-eight thousand, eight hundred thirty".