677177721 has 12 divisors (see below), whose sum is σ = 1067068080. Its totient is φ = 410410680.

The previous prime is 677177719. The next prime is 677177729. The reversal of 677177721 is 127771776.

It is not a de Polignac number, because 677177721 - 2¹ = 677177719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (677177729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3419991 + ... + 3420188.

It is an arithmetic number, because the mean of its divisors is an integer number (88922340).

Almost surely, 2^677177721 is an apocalyptic number.

It is an amenable number.

677177721 is a deficient number, since it is larger than the sum of its proper divisors (389890359).

677177721 is a wasteful number, since it uses less digits than its factorization.

677177721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6840196 (or 6840193 counting only the distinct ones).

The product of its digits is 201684, while the sum is 45.

The square root of 677177721 is about 26022.6386248589. The cubic root of 677177721 is about 878.1476709673.

The spelling of 677177721 in words is "six hundred seventy-seven million, one hundred seventy-seven thousand, seven hundred twenty-one".