690044214721 has 9 divisors (see below), whose sum is σ = 696524370633. Its totient is φ = 683623819440.

The previous prime is 690044214719. The next prime is 690044214731. The reversal of 690044214721 is 127412440096.

The square root of 690044214721 is 830689.

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

It can be written as a sum of positive squares in 4 ways, for example, as 247766013121 + 442278201600 = 497761^2 + 665040^2 .

It is not a de Polignac number, because 690044214721 - 2¹ = 690044214719 is a prime.

It is a super-2 number, since 2×690044214721² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690044214731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 90541291 + ... + 90548911.

It is an arithmetic number, because the mean of its divisors is an integer number (77391596737).

Almost surely, 2^690044214721 is an apocalyptic number.

690044214721 is the 830689-th square number.

690044214721 is the 415345-th centered octagonal number.

It is an amenable number.

690044214721 is a deficient number, since it is larger than the sum of its proper divisors (6480155912).

690044214721 is an frugal number, since it uses more digits than its factorization.

690044214721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15460 (or 7730 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 690044214721 in words is "six hundred ninety billion, forty-four million, two hundred fourteen thousand, seven hundred twenty-one".