687798619 has 2 divisors, whose sum is σ = 687798620. Its totient is φ = 687798618.

The previous prime is 687798589. The next prime is 687798641. The reversal of 687798619 is 916897786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687798619 - 2⁷ = 687798491 is a prime.

It is a super-2 number, since 2×687798619² = 946133880596614322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (687790619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343899309 + 343899310.

It is an arithmetic number, because the mean of its divisors is an integer number (343899310).

Almost surely, 2^687798619 is an apocalyptic number.

687798619 is a deficient number, since it is larger than the sum of its proper divisors (1).

687798619 is an equidigital number, since it uses as much as digits as its factorization.

687798619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 61.

The square root of 687798619 is about 26225.9150269347. The cubic root of 687798619 is about 882.7148506788.

The spelling of 687798619 in words is "six hundred eighty-seven million, seven hundred ninety-eight thousand, six hundred nineteen".