11991628 has 12 divisors (see below), whose sum is σ = 22893192. Its totient is φ = 5450720.

The previous prime is 11991619. The next prime is 11991631. The reversal of 11991628 is 82619911.

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, 136225 + ... + 136312.

It is an arithmetic number, because the mean of its divisors is an integer number (1907766).

Almost surely, 2^11991628 is an apocalyptic number.

It is an amenable number.

11991628 is a deficient number, since it is larger than the sum of its proper divisors (10901564).

11991628 is a wasteful number, since it uses less digits than its factorization.

11991628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272552 (or 272550 counting only the distinct ones).

The product of its digits is 7776, while the sum is 37.

The square root of 11991628 is about 3462.8930101867. The cubic root of 11991628 is about 228.8895941928.

The spelling of 11991628 in words is "eleven million, nine hundred ninety-one thousand, six hundred twenty-eight".