690165440 has 112 divisors (see below), whose sum is σ = 1713731904. Its totient is φ = 264499200.

The previous prime is 690165391. The next prime is 690165449. The reversal of 690165440 is 44561096.

It is a Cunningham number, because it is equal to 26271²-1.

It is a self number, because there is not a number n which added to its sum of digits gives 690165440.

It is not an unprimeable number, because it can be changed into a prime (690165449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840230 + ... + 841050.

Almost surely, 2^690165440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690165440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856865952).

690165440 is an abundant number, since it is smaller than the sum of its proper divisors (1023566464).

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

690165440 is a wasteful number, since it uses less digits than its factorization.

690165440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 690165440 is about 26270.9999809676. Note that the first 4 decimals coincide. The cubic root of 690165440 is about 883.7262107421.

The spelling of 690165440 in words is "six hundred ninety million, one hundred sixty-five thousand, four hundred forty".