673803540 has 72 divisors (see below), whose sum is σ = 2048766720. Its totient is φ = 179250624.

The previous prime is 673803539. The next prime is 673803563. The reversal of 673803540 is 45308376.

It is a happy number.

It is a super-2 number, since 2×673803540² = 908022421033063200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 673803495 and 673803504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74757 + ... + 83283.

Almost surely, 2^673803540 is an apocalyptic number.

673803540 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 673803540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024383360).

673803540 is an abundant number, since it is smaller than the sum of its proper divisors (1374963180).

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

673803540 is a wasteful number, since it uses less digits than its factorization.

673803540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8981 (or 8976 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 673803540 is about 25957.7260175078. The cubic root of 673803540 is about 876.6867230412.

The spelling of 673803540 in words is "six hundred seventy-three million, eight hundred three thousand, five hundred forty".