491421888 has 84 divisors (see below), whose sum is σ = 1441402248. Its totient is φ = 159989760.

The previous prime is 491421881. The next prime is 491421899. The reversal of 491421888 is 888124194.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (491421881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14848 + ... + 34688.

Almost surely, 2^491421888 is an apocalyptic number.

491421888 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491421888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720701124).

491421888 is an abundant number, since it is smaller than the sum of its proper divisors (949980360).

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

491421888 is a wasteful number, since it uses less digits than its factorization.

491421888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19902 (or 19889 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 491421888 is about 22168.0375315453. The cubic root of 491421888 is about 789.1353505261.

The spelling of 491421888 in words is "four hundred ninety-one million, four hundred twenty-one thousand, eight hundred eighty-eight".