673720340 has 24 divisors (see below), whose sum is σ = 1415632680. Its totient is φ = 269331968.

The previous prime is 673720339. The next prime is 673720367. The reversal of 673720340 is 43027376.

It can be written as a sum of positive squares in 4 ways, for example, as 250842244 + 422878096 = 15838^2 + 20564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 673720297 and 673720306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29456 + ... + 47064.

It is an arithmetic number, because the mean of its divisors is an integer number (58984695).

Almost surely, 2^673720340 is an apocalyptic number.

It is an amenable number.

673720340 is an abundant number, since it is smaller than the sum of its proper divisors (741912340).

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

673720340 is a wasteful number, since it uses less digits than its factorization.

673720340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19531 (or 19529 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 32.

The square root of 673720340 is about 25956.1233623205. The cubic root of 673720340 is about 876.6506376774.

The spelling of 673720340 in words is "six hundred seventy-three million, seven hundred twenty thousand, three hundred forty".