690290120569 has 9 divisors (see below), whose sum is σ = 802997313861. Its totient is φ = 591672261180.

The previous prime is 690290120503. The next prime is 690290120579. The reversal of 690290120569 is 965021092096.

The square root of 690290120569 is 830837.

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

It is not a de Polignac number, because 690290120569 - 2¹¹ = 690290118521 is a prime.

It is a super-2 number, since 2×690290120569² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690290120579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5756514 + ... + 5875204.

Almost surely, 2^690290120569 is an apocalyptic number.

690290120569 is the 830837-th square number.

690290120569 is the 415419-th centered octagonal number.

It is an amenable number.

690290120569 is a deficient number, since it is larger than the sum of its proper divisors (112707193292).

690290120569 is an frugal number, since it uses more digits than its factorization.

690290120569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237396 (or 118698 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 49.

Multiplying 690290120569 by its sum of digits (49), we get a square (33824215907881 = 5815859²).

690290120569 divided by its sum of digits (49) gives a square (14087553481 = 118691²).

The spelling of 690290120569 in words is "six hundred ninety billion, two hundred ninety million, one hundred twenty thousand, five hundred sixty-nine".