669786898 has 16 divisors (see below), whose sum is σ = 1153700640. Its totient is φ = 288424800.

The previous prime is 669786889. The next prime is 669786907. The reversal of 669786898 is 898687966.

It is an interprime number because it is at equal distance from previous prime (669786889) and next prime (669786907).

It is a super-2 number, since 2×669786898² = 897228977464924808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800763 + ... + 801598.

It is an arithmetic number, because the mean of its divisors is an integer number (72106290).

Almost surely, 2^669786898 is an apocalyptic number.

669786898 is a deficient number, since it is larger than the sum of its proper divisors (483913742).

669786898 is a wasteful number, since it uses less digits than its factorization.

669786898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602393.

The product of its digits is 62705664, while the sum is 67.

The square root of 669786898 is about 25880.2414594609. The cubic root of 669786898 is about 874.9412305562.

It can be divided in two parts, 6697868 and 98, that added together give a palindrome (6697966).

The spelling of 669786898 in words is "six hundred sixty-nine million, seven hundred eighty-six thousand, eight hundred ninety-eight".