697878891 has 6 divisors (see below), whose sum is σ = 1008047300. Its totient is φ = 465252588.

The previous prime is 697878887. The next prime is 697878919. The reversal of 697878891 is 198878796.

697878891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 697878891 - 2² = 697878887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697878821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38771041 + ... + 38771058.

Almost surely, 2^697878891 is an apocalyptic number.

697878891 is a deficient number, since it is larger than the sum of its proper divisors (310168409).

697878891 is a wasteful number, since it uses less digits than its factorization.

697878891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77542105 (or 77542102 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The square root of 697878891 is about 26417.3975061890. The cubic root of 697878891 is about 887.0062652424.

The spelling of 697878891 in words is "six hundred ninety-seven million, eight hundred seventy-eight thousand, eight hundred ninety-one".