690991488 has 192 divisors, whose sum is σ = 2240409600. Its totient is φ = 202521600.

The previous prime is 690991453. The next prime is 690991489. The reversal of 690991488 is 884199096.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690991489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391953 + ... + 393711.

It is an arithmetic number, because the mean of its divisors is an integer number (11668800).

Almost surely, 2^690991488 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 690991488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120204800).

690991488 is an abundant number, since it is smaller than the sum of its proper divisors (1549418112).

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

690991488 is a wasteful number, since it uses less digits than its factorization.

690991488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 690991488 is about 26286.7169498209. The cubic root of 690991488 is about 884.0786427718.

The spelling of 690991488 in words is "six hundred ninety million, nine hundred ninety-one thousand, four hundred eighty-eight".