673978578 has 32 divisors (see below), whose sum is σ = 1659025536. Its totient is φ = 177752448.

The previous prime is 673978561. The next prime is 673978579. The reversal of 673978578 is 875879376.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (673978579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616651 + ... + 617742.

It is an arithmetic number, because the mean of its divisors is an integer number (51844548).

Almost surely, 2^673978578 is an apocalyptic number.

673978578 is an abundant number, since it is smaller than the sum of its proper divisors (985046958).

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

673978578 is a wasteful number, since it uses less digits than its factorization.

673978578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234418.

The product of its digits is 17781120, while the sum is 60.

The square root of 673978578 is about 25961.0973959114. The cubic root of 673978578 is about 876.7626305304.

The spelling of 673978578 in words is "six hundred seventy-three million, nine hundred seventy-eight thousand, five hundred seventy-eight".