2155728607 has 16 divisors (see below), whose sum is σ = 2223636480. Its totient is φ = 2089094112.

The previous prime is 2155728599. The next prime is 2155728611. The reversal of 2155728607 is 7068275512.

It is a cyclic number.

It is not a de Polignac number, because 2155728607 - 2³ = 2155728599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155728647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295458 + ... + 1297120.

It is an arithmetic number, because the mean of its divisors is an integer number (138977280).

Almost surely, 2^2155728607 is an apocalyptic number.

2155728607 is a deficient number, since it is larger than the sum of its proper divisors (67907873).

2155728607 is a wasteful number, since it uses less digits than its factorization.

2155728607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 2155728607 is about 46429.8245419902. The cubic root of 2155728607 is about 1291.8081742176.

The spelling of 2155728607 in words is "two billion, one hundred fifty-five million, seven hundred twenty-eight thousand, six hundred seven".