691473672 has 60 divisors (see below), whose sum is σ = 1938643245. Its totient is φ = 230268096.

The previous prime is 691473667. The next prime is 691473677. The reversal of 691473672 is 276374196.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (691473667) and next prime (691473677).

It can be written as a sum of positive squares in 2 ways, for example, as 472019076 + 219454596 = 21726^2 + 14814^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18594.

It is not an unprimeable number, because it can be changed into a prime (691473677) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 668868 + ... + 669900.

Almost surely, 2^691473672 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 691473672

691473672 is an abundant number, since it is smaller than the sum of its proper divisors (1247169573).

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

691473672 is an equidigital number, since it uses as much as digits as its factorization.

691473672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 1038 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 691473672 is about 26295.8869787653. The cubic root of 691473672 is about 884.2842359739.

It can be divided in two parts, 69 and 1473672, that added together give a palindrome (1473741).

The spelling of 691473672 in words is "six hundred ninety-one million, four hundred seventy-three thousand, six hundred seventy-two".