11191257928 has 8 divisors (see below), whose sum is σ = 20983608630. Its totient is φ = 5595628960.

The previous prime is 11191257911. The next prime is 11191257929. The reversal of 11191257928 is 82975219111.

It can be written as a sum of positive squares in only one way, i.e., 8697054564 + 2494203364 = 93258^2 + 49942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×11191257928² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (11191257929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699453613 + ... + 699453628.

Almost surely, 2^11191257928 is an apocalyptic number.

It is an amenable number.

11191257928 is a deficient number, since it is larger than the sum of its proper divisors (9792350702).

11191257928 is a wasteful number, since it uses less digits than its factorization.

11191257928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398907247 (or 1398907243 counting only the distinct ones).

The product of its digits is 90720, while the sum is 46.

The spelling of 11191257928 in words is "eleven billion, one hundred ninety-one million, two hundred fifty-seven thousand, nine hundred twenty-eight".