677661809 has 16 divisors (see below), whose sum is σ = 779064000. Its totient is φ = 582966720.

The previous prime is 677661797. The next prime is 677661833. The reversal of 677661809 is 908166776.

It is a cyclic number.

It is not a de Polignac number, because 677661809 - 2¹² = 677657713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (677664809) 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, 297527 + ... + 299795.

It is an arithmetic number, because the mean of its divisors is an integer number (48691500).

Almost surely, 2^677661809 is an apocalyptic number.

It is an amenable number.

677661809 is a deficient number, since it is larger than the sum of its proper divisors (101402191).

677661809 is a wasteful number, since it uses less digits than its factorization.

677661809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 677661809 is about 26031.9382490048. The cubic root of 677661809 is about 878.3568723240.

The spelling of 677661809 in words is "six hundred seventy-seven million, six hundred sixty-one thousand, eight hundred nine".