770128155 has 20 divisors (see below), whose sum is σ = 1380526752. Its totient is φ = 410734800.

The previous prime is 770128153. The next prime is 770128181. The reversal of 770128155 is 551821077.

It is not a de Polignac number, because 770128155 - 2¹ = 770128153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (770128153) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 950371 + ... + 951180.

Almost surely, 2^770128155 is an apocalyptic number.

770128155 is a deficient number, since it is larger than the sum of its proper divisors (610398597).

770128155 is a wasteful number, since it uses less digits than its factorization.

770128155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901568 (or 1901559 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 770128155 is about 27751.1829477592. The cubic root of 770128155 is about 916.6164921665.

The spelling of 770128155 in words is "seven hundred seventy million, one hundred twenty-eight thousand, one hundred fifty-five".