687275091 has 8 divisors (see below), whose sum is σ = 1018185360. Its totient is φ = 458183376.

The previous prime is 687275033. The next prime is 687275093. The reversal of 687275091 is 190572786.

It is not a de Polignac number, because 687275091 - 2⁹ = 687274579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687275093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12727290 + ... + 12727343.

It is an arithmetic number, because the mean of its divisors is an integer number (127273170).

Almost surely, 2^687275091 is an apocalyptic number.

687275091 is a deficient number, since it is larger than the sum of its proper divisors (330910269).

687275091 is a wasteful number, since it uses less digits than its factorization.

687275091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25454642 (or 25454636 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 687275091 is about 26215.9320070830. The cubic root of 687275091 is about 882.4908300481.

The spelling of 687275091 in words is "six hundred eighty-seven million, two hundred seventy-five thousand, ninety-one".