677781921 has 8 divisors (see below), whose sum is σ = 912483520. Its totient is φ = 447467472.

The previous prime is 677781913. The next prime is 677781941. The reversal of 677781921 is 129187776.

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

It is not a de Polignac number, because 677781921 - 2³ = 677781913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (677781941) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1096426 + ... + 1097043.

It is an arithmetic number, because the mean of its divisors is an integer number (114060440).

Almost surely, 2^677781921 is an apocalyptic number.

It is an amenable number.

677781921 is a deficient number, since it is larger than the sum of its proper divisors (234701599).

677781921 is a wasteful number, since it uses less digits than its factorization.

677781921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193575.

The product of its digits is 296352, while the sum is 48.

The square root of 677781921 is about 26034.2451590208. The cubic root of 677781921 is about 878.4087639740.

The spelling of 677781921 in words is "six hundred seventy-seven million, seven hundred eighty-one thousand, nine hundred twenty-one".