691985472 has 224 divisors, whose sum is σ = 2067763200. Its totient is φ = 203212800.

The previous prime is 691985423. The next prime is 691985509. The reversal of 691985472 is 274589196.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3279447 + ... + 3279657.

Almost surely, 2^691985472 is an apocalyptic number.

691985472 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691985472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033881600).

691985472 is an abundant number, since it is smaller than the sum of its proper divisors (1375777728).

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

691985472 is a wasteful number, since it uses less digits than its factorization.

691985472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 295 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 691985472 is about 26305.6167386359. The cubic root of 691985472 is about 884.5023522844.

The spelling of 691985472 in words is "six hundred ninety-one million, nine hundred eighty-five thousand, four hundred seventy-two".