673211520 has 128 divisors (see below), whose sum is σ = 2384352000. Its totient is φ = 179518464.

The previous prime is 673211507. The next prime is 673211527. The reversal of 673211520 is 25112376.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (673211527) by changing a digit.

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, 2200 + ... + 36759.

It is an arithmetic number, because the mean of its divisors is an integer number (18627750).

Almost surely, 2^673211520 is an apocalyptic number.

673211520 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 673211520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192176000).

673211520 is an abundant number, since it is smaller than the sum of its proper divisors (1711140480).

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

673211520 is a wasteful number, since it uses less digits than its factorization.

673211520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38987 (or 38969 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 673211520 is about 25946.3199702771. The cubic root of 673211520 is about 876.4298884577.

Adding to 673211520 its reverse (25112376), we get a palindrome (698323896).

The spelling of 673211520 in words is "six hundred seventy-three million, two hundred eleven thousand, five hundred twenty".