691725804 has 96 divisors (see below), whose sum is σ = 2066781696. Its totient is φ = 174804480.

The previous prime is 691725803. The next prime is 691725877. The reversal of 691725804 is 408527196.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (691725803) 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 31 ways as a sum of consecutive naturals, for example, 24072 + ... + 44304.

It is an arithmetic number, because the mean of its divisors is an integer number (21528976).

Almost surely, 2^691725804 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 691725804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033390848).

691725804 is an abundant number, since it is smaller than the sum of its proper divisors (1375055892).

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

691725804 is a wasteful number, since it uses less digits than its factorization.

691725804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20295 (or 20293 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 691725804 is about 26300.6806756023. The cubic root of 691725804 is about 884.3917017477.

The spelling of 691725804 in words is "six hundred ninety-one million, seven hundred twenty-five thousand, eight hundred four".