11551787428 has 24 divisors (see below), whose sum is σ = 21486221120. Its totient is φ = 5418770400.

The previous prime is 11551787381. The next prime is 11551787431. The reversal of 11551787428 is 82478715511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730023 + ... + 745678.

Almost surely, 2^11551787428 is an apocalyptic number.

It is an amenable number.

11551787428 is a deficient number, since it is larger than the sum of its proper divisors (9934433692).

11551787428 is a wasteful number, since it uses less digits than its factorization.

11551787428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475827 (or 1475825 counting only the distinct ones).

The product of its digits is 627200, while the sum is 49.

The spelling of 11551787428 in words is "eleven billion, five hundred fifty-one million, seven hundred eighty-seven thousand, four hundred twenty-eight".