685428487 has 2 divisors, whose sum is σ = 685428488. Its totient is φ = 685428486.

The previous prime is 685428461. The next prime is 685428493. The reversal of 685428487 is 784824586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685428487 is a prime.

It is a super-2 number, since 2×685428487² = 939624421582218338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685428437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342714243 + 342714244.

It is an arithmetic number, because the mean of its divisors is an integer number (342714244).

Almost surely, 2^685428487 is an apocalyptic number.

685428487 is a deficient number, since it is larger than the sum of its proper divisors (1).

685428487 is an equidigital number, since it uses as much as digits as its factorization.

685428487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3440640, while the sum is 52.

The square root of 685428487 is about 26180.6892002483. The cubic root of 685428487 is about 881.6997480846.

The spelling of 685428487 in words is "six hundred eighty-five million, four hundred twenty-eight thousand, four hundred eighty-seven".