673261978 has 8 divisors (see below), whose sum is σ = 1012437972. Its totient is φ = 335782656.

The previous prime is 673261961. The next prime is 673261987. The reversal of 673261978 is 879162376.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 650097009 + 23164969 = 25497^2 + 4813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 423175 + ... + 424762.

Almost surely, 2^673261978 is an apocalyptic number.

673261978 is a deficient number, since it is larger than the sum of its proper divisors (339175994).

673261978 is a wasteful number, since it uses less digits than its factorization.

673261978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848336.

The product of its digits is 762048, while the sum is 49.

The square root of 673261978 is about 25947.2923057494. The cubic root of 673261978 is about 876.4517843964.

The spelling of 673261978 in words is "six hundred seventy-three million, two hundred sixty-one thousand, nine hundred seventy-eight".