687819493 has 8 divisors (see below), whose sum is σ = 693316800. Its totient is φ = 682340928.

The previous prime is 687819491. The next prime is 687819499. The reversal of 687819493 is 394918786.

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 687819493 - 2¹ = 687819491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687819491) 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, 74205 + ... + 82957.

It is an arithmetic number, because the mean of its divisors is an integer number (86664600).

Almost surely, 2^687819493 is an apocalyptic number.

It is an amenable number.

687819493 is a deficient number, since it is larger than the sum of its proper divisors (5497307).

687819493 is a wasteful number, since it uses less digits than its factorization.

687819493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9371.

The product of its digits is 2612736, while the sum is 55.

The square root of 687819493 is about 26226.3129890574. The cubic root of 687819493 is about 882.7237804260.

The spelling of 687819493 in words is "six hundred eighty-seven million, eight hundred nineteen thousand, four hundred ninety-three".