689750973 has 24 divisors (see below), whose sum is σ = 1014544440. Its totient is φ = 451445760.

The previous prime is 689750969. The next prime is 689750981. The reversal of 689750973 is 379057986.

689750973 is a `hidden beast` number, since 68 + 9 + 7 + 509 + 73 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3992004 + 685758969 = 1998^2 + 26187^2 .

It is not a de Polignac number, because 689750973 - 2² = 689750969 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689750923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 443365 + ... + 444917.

It is an arithmetic number, because the mean of its divisors is an integer number (42272685).

Almost surely, 2^689750973 is an apocalyptic number.

It is an amenable number.

689750973 is a deficient number, since it is larger than the sum of its proper divisors (324793467).

689750973 is a wasteful number, since it uses less digits than its factorization.

689750973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429 (or 2426 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 689750973 is about 26263.1104974259. The cubic root of 689750973 is about 883.5492731198.

The spelling of 689750973 in words is "six hundred eighty-nine million, seven hundred fifty thousand, nine hundred seventy-three".