391677760867 has 24 divisors (see below), whose sum is σ = 419259440880. Its totient is φ = 365788535040.

The previous prime is 391677760823. The next prime is 391677760871. The reversal of 391677760867 is 768067776193.

It is not a de Polignac number, because 391677760867 - 2⁷ = 391677760739 is a prime.

It is a super-2 number, since 2×391677760867² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391677760967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88833759 + ... + 88838167.

It is an arithmetic number, because the mean of its divisors is an integer number (17469143370).

Almost surely, 2^391677760867 is an apocalyptic number.

391677760867 is a deficient number, since it is larger than the sum of its proper divisors (27581680013).

391677760867 is a wasteful number, since it uses less digits than its factorization.

391677760867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7891 (or 7872 counting only the distinct ones).

The product of its (nonzero) digits is 112021056, while the sum is 67.

The spelling of 391677760867 in words is "three hundred ninety-one billion, six hundred seventy-seven million, seven hundred sixty thousand, eight hundred sixty-seven".