671636448 has 216 divisors, whose sum is σ = 2271617712. Its totient is φ = 191476224.

The previous prime is 671636437. The next prime is 671636467. The reversal of 671636448 is 844636176.

It is a happy number.

671636448 is a `hidden beast` number, since 6 + 7 + 1 + 636 + 4 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1469436 + ... + 1469892.

Almost surely, 2^671636448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671636448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135808856).

671636448 is an abundant number, since it is smaller than the sum of its proper divisors (1599981264).

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

671636448 is an frugal number, since it uses more digits than its factorization.

671636448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 469 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 671636448 is about 25915.9496835443. The cubic root of 671636448 is about 875.7458448275.

The spelling of 671636448 in words is "six hundred seventy-one million, six hundred thirty-six thousand, four hundred forty-eight".