685419787 has 16 divisors (see below), whose sum is σ = 783578880. Its totient is φ = 593943552.

The previous prime is 685419773. The next prime is 685419799. The reversal of 685419787 is 787914586.

685419787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685419787 - 2²⁷ = 551202059 is a prime.

It is a super-2 number, since 2×685419787² = 939600568822250738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685419187) 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, 86598 + ... + 94180.

It is an arithmetic number, because the mean of its divisors is an integer number (48973680).

Almost surely, 2^685419787 is an apocalyptic number.

685419787 is a deficient number, since it is larger than the sum of its proper divisors (98159093).

685419787 is a wasteful number, since it uses less digits than its factorization.

685419787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8022.

The product of its digits is 3386880, while the sum is 55.

The square root of 685419787 is about 26180.5230467231. The cubic root of 685419787 is about 881.6960176589.

It can be divided in two parts, 685419 and 787, that added together give a triangular number (686206 = T₁₁₇₁).

The spelling of 685419787 in words is "six hundred eighty-five million, four hundred nineteen thousand, seven hundred eighty-seven".