673121620 has 12 divisors (see below), whose sum is σ = 1413555444. Its totient is φ = 269248640.

The previous prime is 673121587. The next prime is 673121621. The reversal of 673121620 is 26121376.

It can be written as a sum of positive squares in 2 ways, for example, as 468116496 + 205005124 = 21636^2 + 14318^2 .

It is a super-2 number, since 2×673121620² = 906185430622848800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673121621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16828021 + ... + 16828060.

It is an arithmetic number, because the mean of its divisors is an integer number (117796287).

Almost surely, 2^673121620 is an apocalyptic number.

It is an amenable number.

673121620 is an abundant number, since it is smaller than the sum of its proper divisors (740433824).

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

673121620 is a wasteful number, since it uses less digits than its factorization.

673121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33656090 (or 33656088 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 673121620 is about 25944.5874894938. The cubic root of 673121620 is about 876.3908741944.

Adding to 673121620 its reverse (26121376), we get a palindrome (699242996).

The spelling of 673121620 in words is "six hundred seventy-three million, one hundred twenty-one thousand, six hundred twenty".