690876891 has 16 divisors (see below), whose sum is σ = 1037545120. Its totient is φ = 454273920.

The previous prime is 690876887. The next prime is 690876919. The reversal of 690876891 is 198678096.

It is not a de Polignac number, because 690876891 - 2² = 690876887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690876871) 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, 173290 + ... + 177231.

It is an arithmetic number, because the mean of its divisors is an integer number (64846570).

Almost surely, 2^690876891 is an apocalyptic number.

690876891 is a deficient number, since it is larger than the sum of its proper divisors (346668229).

690876891 is a wasteful number, since it uses less digits than its factorization.

690876891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350603 (or 350597 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 690876891 is about 26284.5371083457. The cubic root of 690876891 is about 884.0297669351.

The spelling of 690876891 in words is "six hundred ninety million, eight hundred seventy-six thousand, eight hundred ninety-one".