2155720060 has 36 divisors (see below), whose sum is σ = 4902038568. Its totient is φ = 795956928.

The previous prime is 2155720051. The next prime is 2155720081. The reversal of 2155720060 is 600275512.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 315514 + ... + 322273.

It is an arithmetic number, because the mean of its divisors is an integer number (136167738).

Almost surely, 2^2155720060 is an apocalyptic number.

2155720060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155720060 is an abundant number, since it is smaller than the sum of its proper divisors (2746318508).

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

2155720060 is a wasteful number, since it uses less digits than its factorization.

2155720060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637822 (or 637807 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 2155720060 is about 46429.7324997679. The cubic root of 2155720060 is about 1291.8064669682.

Adding to 2155720060 its reverse (600275512), we get a palindrome (2755995572).

It can be divided in two parts, 215 and 5720060, that added together give a palindrome (5720275).

The spelling of 2155720060 in words is "two billion, one hundred fifty-five million, seven hundred twenty thousand, sixty".