1991260608 has 28 divisors (see below), whose sum is σ = 5268544200. Its totient is φ = 663753472.

The previous prime is 1991260577. The next prime is 1991260651. The reversal of 1991260608 is 8060621991.

It is a self number, because there is not a number n which added to its sum of digits gives 1991260608.

It is a congruent number.

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, 5185383 + ... + 5185766.

Almost surely, 2^1991260608 is an apocalyptic number.

It is an amenable number.

1991260608 is an abundant number, since it is smaller than the sum of its proper divisors (3277283592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991260608 is a wasteful number, since it uses less digits than its factorization.

1991260608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371164 (or 10371154 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1991260608 is about 44623.5432031120. The cubic root of 1991260608 is about 1258.0832130363.

The spelling of 1991260608 in words is "one billion, nine hundred ninety-one million, two hundred sixty thousand, six hundred eight".