11111428 has 12 divisors (see below), whose sum is σ = 20468560. Its totient is φ = 5263272.

The previous prime is 11111417. The next prime is 11111431. The reversal of 11111428 is 82411111.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73026 + ... + 73177.

Almost surely, 2^11111428 is an apocalyptic number.

It is an amenable number.

11111428 is a deficient number, since it is larger than the sum of its proper divisors (9357132).

11111428 is a wasteful number, since it uses less digits than its factorization.

11111428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146226 (or 146224 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

The square root of 11111428 is about 3333.3808663278. The cubic root of 11111428 is about 223.1464380325.

Adding to 11111428 its reverse (82411111), we get a palindrome (93522539).

The spelling of 11111428 in words is "eleven million, one hundred eleven thousand, four hundred twenty-eight".