671451648 has 160 divisors (see below), whose sum is σ = 2061189504. Its totient is φ = 190267392.

The previous prime is 671451631. The next prime is 671451653. The reversal of 671451648 is 846154176.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2117986 + ... + 2118302.

Almost surely, 2^671451648 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 671451648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030594752).

671451648 is an abundant number, since it is smaller than the sum of its proper divisors (1389737856).

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

671451648 is a wasteful number, since it uses less digits than its factorization.

671451648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 526 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 671451648 is about 25912.3840663108. The cubic root of 671451648 is about 875.6655173041.

The spelling of 671451648 in words is "six hundred seventy-one million, four hundred fifty-one thousand, six hundred forty-eight".