687294491 has 8 divisors (see below), whose sum is σ = 747082224. Its totient is φ = 628495200.

The previous prime is 687294463. The next prime is 687294497. The reversal of 687294491 is 194492786.

687294491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687294491 - 2⁶ = 687294427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687294497) 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, 245660 + ... + 248441.

It is an arithmetic number, because the mean of its divisors is an integer number (93385278).

Almost surely, 2^687294491 is an apocalyptic number.

687294491 is a deficient number, since it is larger than the sum of its proper divisors (59787733).

687294491 is a wasteful number, since it uses less digits than its factorization.

687294491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494221.

The product of its digits is 870912, while the sum is 50.

The square root of 687294491 is about 26216.3020084832. The cubic root of 687294491 is about 882.4991334486.

The spelling of 687294491 in words is "six hundred eighty-seven million, two hundred ninety-four thousand, four hundred ninety-one".