689669802 has 20 divisors (see below), whose sum is σ = 1545371586. Its totient is φ = 229889880.

The previous prime is 689669777. The next prime is 689669831. The reversal of 689669802 is 208966986.

It can be written as a sum of positive squares in only one way, i.e., 598829841 + 90839961 = 24471^2 + 9531^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2128449 + ... + 2128772.

Almost surely, 2^689669802 is an apocalyptic number.

689669802 is an abundant number, since it is smaller than the sum of its proper divisors (855701784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689669802 is a wasteful number, since it uses less digits than its factorization.

689669802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257235 (or 4257226 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 689669802 is about 26261.5651094903. The cubic root of 689669802 is about 883.5146125952.

The spelling of 689669802 in words is "six hundred eighty-nine million, six hundred sixty-nine thousand, eight hundred two".