689824930249 has 27 divisors (see below), whose sum is σ = 869019721767. Its totient is φ = 545735749104.

The previous prime is 689824930219. The next prime is 689824930261. The reversal of 689824930249 is 942039428986.

The square root of 689824930249 is 830557.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 102045108025 + 587779822224 = 319445^2 + 766668^2 .

It is not a de Polignac number, because 689824930249 - 2³⁹ = 140069116361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689824930219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 75576124 + ... + 75585250.

It is an arithmetic number, because the mean of its divisors is an integer number (32185915621).

Almost surely, 2^689824930249 is an apocalyptic number.

689824930249 is the 830557-th square number.

689824930249 is the 415279-th centered octagonal number.

It is an amenable number.

689824930249 is a deficient number, since it is larger than the sum of its proper divisors (179194791518).

689824930249 is an frugal number, since it uses more digits than its factorization.

689824930249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18294 (or 9147 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 64.

Multiplying 689824930249 by its sum of digits (64), we get a square (44148795535936 = 6644456²).

The spelling of 689824930249 in words is "six hundred eighty-nine billion, eight hundred twenty-four million, nine hundred thirty thousand, two hundred forty-nine".