671099904 has 308 divisors, whose sum is σ = 2147876160. Its totient is φ = 209018880.

The previous prime is 671099867. The next prime is 671099909. The reversal of 671099904 is 409990176.

It is a super-2 number, since 2×671099904² = 900750162297618432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 671099904.

It is not an unprimeable number, because it can be changed into a prime (671099909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 21648369 + ... + 21648399.

Almost surely, 2^671099904 is an apocalyptic number.

671099904 is a gapful number since it is divisible by the number (64) 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 671099904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073938080).

671099904 is an abundant number, since it is smaller than the sum of its proper divisors (1476776256).

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

671099904 is an equidigital number, since it uses as much as digits as its factorization.

671099904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 671099904 is about 25905.5959977762. The cubic root of 671099904 is about 875.5125830397.

The spelling of 671099904 in words is "six hundred seventy-one million, ninety-nine thousand, nine hundred four".