673776021 has 8 divisors (see below), whose sum is σ = 905442304. Its totient is φ = 445646880.

The previous prime is 673776017. The next prime is 673776071. The reversal of 673776021 is 120677376.

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

It is not a de Polignac number, because 673776021 - 2² = 673776017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673776071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883840 + ... + 884601.

It is an arithmetic number, because the mean of its divisors is an integer number (113180288).

Almost surely, 2^673776021 is an apocalyptic number.

It is an amenable number.

673776021 is a deficient number, since it is larger than the sum of its proper divisors (231666283).

673776021 is a wasteful number, since it uses less digits than its factorization.

673776021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768571.

The product of its (nonzero) digits is 74088, while the sum is 39.

The square root of 673776021 is about 25957.1959386988. The cubic root of 673776021 is about 876.6747878757.

The spelling of 673776021 in words is "six hundred seventy-three million, seven hundred seventy-six thousand, twenty-one".