685428479 has 4 divisors (see below), whose sum is σ = 685502976. Its totient is φ = 685353984.

The previous prime is 685428461. The next prime is 685428487. The reversal of 685428479 is 974824586.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685428479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685428479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685428179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21119 + ... + 42624.

It is an arithmetic number, because the mean of its divisors is an integer number (171375744).

Almost surely, 2^685428479 is an apocalyptic number.

685428479 is a deficient number, since it is larger than the sum of its proper divisors (74497).

685428479 is a wasteful number, since it uses less digits than its factorization.

685428479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74496.

The product of its digits is 3870720, while the sum is 53.

The square root of 685428479 is about 26180.6890474640. The cubic root of 685428479 is about 881.6997446544.

The spelling of 685428479 in words is "six hundred eighty-five million, four hundred twenty-eight thousand, four hundred seventy-nine".