11891457408 has 32 divisors (see below), whose sum is σ = 31586684760. Its totient is φ = 3963819008.

The previous prime is 11891457397. The next prime is 11891457433. The reversal of 11891457408 is 80475419811.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 15483285 + ... + 15484052.

Almost surely, 2^11891457408 is an apocalyptic number.

It is an amenable number.

11891457408 is an abundant number, since it is smaller than the sum of its proper divisors (19695227352).

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

11891457408 is an equidigital number, since it uses as much as digits as its factorization.

11891457408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30967354 (or 30967342 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 11891457408 in words is "eleven billion, eight hundred ninety-one million, four hundred fifty-seven thousand, four hundred eight".