1673543540 has 48 divisors (see below), whose sum is σ = 3612425040. Its totient is φ = 651002880.

The previous prime is 1673543539. The next prime is 1673543561. The reversal of 1673543540 is 453453761.

It can be written as a sum of positive squares in 8 ways, for example, as 178329316 + 1495214224 = 13354^2 + 38668^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1673543494 and 1673543503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100874 + ... + 116286.

It is an arithmetic number, because the mean of its divisors is an integer number (75258855).

Almost surely, 2^1673543540 is an apocalyptic number.

1673543540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1673543540 is an abundant number, since it is smaller than the sum of its proper divisors (1938881500).

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

1673543540 is a wasteful number, since it uses less digits than its factorization.

1673543540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15572 (or 15570 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 1673543540 is about 40908.9664988007. The cubic root of 1673543540 is about 1187.2595507992.

The spelling of 1673543540 in words is "one billion, six hundred seventy-three million, five hundred forty-three thousand, five hundred forty".