1265728671 has 24 divisors (see below), whose sum is σ = 1923505584. Its totient is φ = 800979840.

The previous prime is 1265728657. The next prime is 1265728687. The reversal of 1265728671 is 1768275621.

1265728671 is a `hidden beast` number, since 1 + 2 + 6 + 572 + 8 + 6 + 71 = 666.

It is not a de Polignac number, because 1265728671 - 2¹⁰ = 1265727647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265728621) 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 23 ways as a sum of consecutive naturals, for example, 32701 + ... + 60006.

It is an arithmetic number, because the mean of its divisors is an integer number (80146066).

Almost surely, 2^1265728671 is an apocalyptic number.

1265728671 is a deficient number, since it is larger than the sum of its proper divisors (657776913).

1265728671 is a wasteful number, since it uses less digits than its factorization.

1265728671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92791 (or 92788 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1265728671 is about 35577.0806981124. The cubic root of 1265728671 is about 1081.7167116314.

It can be divided in two parts, 12657 and 28671, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 1265728671 in words is "one billion, two hundred sixty-five million, seven hundred twenty-eight thousand, six hundred seventy-one".