689769787 has 16 divisors (see below), whose sum is σ = 830536960. Its totient is φ = 559615392.

The previous prime is 689769779. The next prime is 689769811. The reversal of 689769787 is 787967986.

689769787 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 689769787 - 2³ = 689769779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689769737) 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, 255748 + ... + 258430.

It is an arithmetic number, because the mean of its divisors is an integer number (51908560).

Almost surely, 2^689769787 is an apocalyptic number.

689769787 is a deficient number, since it is larger than the sum of its proper divisors (140767173).

689769787 is a wasteful number, since it uses less digits than its factorization.

689769787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4642.

The product of its digits is 64012032, while the sum is 67.

The square root of 689769787 is about 26263.4686779945. The cubic root of 689769787 is about 883.5573064272.

The spelling of 689769787 in words is "six hundred eighty-nine million, seven hundred sixty-nine thousand, seven hundred eighty-seven".