676779421 has 4 divisors (see below), whose sum is σ = 677681344. Its totient is φ = 675877500.

The previous prime is 676779413. The next prime is 676779443. The reversal of 676779421 is 124977676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 676779421 - 2³ = 676779413 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 (676779121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449835 + ... + 451336.

It is an arithmetic number, because the mean of its divisors is an integer number (169420336).

Almost surely, 2^676779421 is an apocalyptic number.

It is an amenable number.

676779421 is a deficient number, since it is larger than the sum of its proper divisors (901923).

676779421 is an equidigital number, since it uses as much as digits as its factorization.

676779421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901922.

The product of its digits is 889056, while the sum is 49.

The square root of 676779421 is about 26014.9845473719. The cubic root of 676779421 is about 877.9754686027.

The spelling of 676779421 in words is "six hundred seventy-six million, seven hundred seventy-nine thousand, four hundred twenty-one".