673747856 has 10 divisors (see below), whose sum is σ = 1305386502. Its totient is φ = 336873920.

The previous prime is 673747853. The next prime is 673747883. The reversal of 673747856 is 658747376.

It can be written as a sum of positive squares in only one way, i.e., 491065600 + 182682256 = 22160^2 + 13516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 673747798 and 673747807.

It is not an unprimeable number, because it can be changed into a prime (673747853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21054605 + ... + 21054636.

Almost surely, 2^673747856 is an apocalyptic number.

It is an amenable number.

673747856 is a deficient number, since it is larger than the sum of its proper divisors (631638646).

673747856 is a wasteful number, since it uses less digits than its factorization.

673747856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42109249 (or 42109243 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 53.

The square root of 673747856 is about 25956.6534052447. The cubic root of 673747856 is about 876.6625721993.

The spelling of 673747856 in words is "six hundred seventy-three million, seven hundred forty-seven thousand, eight hundred fifty-six".