689276988 has 36 divisors (see below), whose sum is σ = 1802422440. Its totient is φ = 221835936.

The previous prime is 689276977. The next prime is 689276989. The reversal of 689276988 is 889672986.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689276989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329070 + ... + 331157.

It is an arithmetic number, because the mean of its divisors is an integer number (50067290).

Almost surely, 2^689276988 is an apocalyptic number.

It is an amenable number.

689276988 is an abundant number, since it is smaller than the sum of its proper divisors (1113145452).

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

689276988 is a wasteful number, since it uses less digits than its factorization.

689276988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660266 (or 660261 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The square root of 689276988 is about 26254.0851678363. The cubic root of 689276988 is about 883.3468401242.

The spelling of 689276988 in words is "six hundred eighty-nine million, two hundred seventy-six thousand, nine hundred eighty-eight".