671993280 has 448 divisors, whose sum is σ = 2785628160. Its totient is φ = 149299200.

The previous prime is 671993269. The next prime is 671993291. The reversal of 671993280 is 82399176.

It is an interprime number because it is at equal distance from previous prime (671993269) and next prime (671993291).

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2479545 + ... + 2479815.

It is an arithmetic number, because the mean of its divisors is an integer number (6217920).

Almost surely, 2^671993280 is an apocalyptic number.

671993280 is a gapful number since it is divisible by the number (60) 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 671993280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1392814080).

671993280 is an abundant number, since it is smaller than the sum of its proper divisors (2113634880).

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

671993280 is a wasteful number, since it uses less digits than its factorization.

671993280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 671993280 is about 25922.8331784934. The cubic root of 671993280 is about 875.9009082884.

It can be divided in two parts, 6719 and 93280, that added together give a palindrome (99999).

The spelling of 671993280 in words is "six hundred seventy-one million, nine hundred ninety-three thousand, two hundred eighty".