673879928821 has 16 divisors (see below), whose sum is σ = 787763527488. Its totient is φ = 569634976000.

The previous prime is 673879928819. The next prime is 673879928849. The reversal of 673879928821 is 128829978376.

It is not a de Polignac number, because 673879928821 - 2¹ = 673879928819 is a prime.

It is a super-2 number, since 2×673879928821² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673879928801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21693130 + ... + 21724171.

It is an arithmetic number, because the mean of its divisors is an integer number (49235220468).

Almost surely, 2^673879928821 is an apocalyptic number.

It is an amenable number.

673879928821 is a deficient number, since it is larger than the sum of its proper divisors (113883598667).

673879928821 is a wasteful number, since it uses less digits than its factorization.

673879928821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43417412.

The product of its digits is 146313216, while the sum is 70.

The spelling of 673879928821 in words is "six hundred seventy-three billion, eight hundred seventy-nine million, nine hundred twenty-eight thousand, eight hundred twenty-one".