689318993 has 32 divisors (see below), whose sum is σ = 831375360. Its totient is φ = 564157440.

The previous prime is 689318983. The next prime is 689319011. The reversal of 689318993 is 399813986.

It is not a de Polignac number, because 689318993 - 2⁴ = 689318977 is a prime.

It is a super-2 number, since 2×689318993² = 950321348221068098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689318923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 927380 + ... + 928122.

It is an arithmetic number, because the mean of its divisors is an integer number (25980480).

Almost surely, 2^689318993 is an apocalyptic number.

It is an amenable number.

689318993 is a deficient number, since it is larger than the sum of its proper divisors (142056367).

689318993 is a wasteful number, since it uses less digits than its factorization.

689318993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989.

The product of its digits is 2519424, while the sum is 56.

The square root of 689318993 is about 26254.8851263912. The cubic root of 689318993 is about 883.3647836751.

The spelling of 689318993 in words is "six hundred eighty-nine million, three hundred eighteen thousand, nine hundred ninety-three".