11287574781 has 24 divisors (see below), whose sum is σ = 17608496544. Its totient is φ = 6412744800.

The previous prime is 11287574723. The next prime is 11287574789. The reversal of 11287574781 is 18747578211.

It is not a de Polignac number, because 11287574781 - 2¹⁸ = 11287312637 is a prime.

It is a super-2 number, since 2×11287574781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11287574789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196495 + ... + 247356.

It is an arithmetic number, because the mean of its divisors is an integer number (733687356).

Almost surely, 2^11287574781 is an apocalyptic number.

It is an amenable number.

11287574781 is a deficient number, since it is larger than the sum of its proper divisors (6320921763).

11287574781 is a wasteful number, since it uses less digits than its factorization.

11287574781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444041 (or 444034 counting only the distinct ones).

The product of its digits is 878080, while the sum is 51.

The spelling of 11287574781 in words is "eleven billion, two hundred eighty-seven million, five hundred seventy-four thousand, seven hundred eighty-one".