691006080 has 256 divisors, whose sum is σ = 2310716160. Its totient is φ = 175472640.

The previous prime is 691006073. The next prime is 691006093. The reversal of 691006080 is 80600196.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 5043772 + ... + 5043908.

It is an arithmetic number, because the mean of its divisors is an integer number (9026235).

Almost surely, 2^691006080 is an apocalyptic number.

691006080 is a gapful number since it is divisible by the number (60) 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 691006080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1155358080).

691006080 is an abundant number, since it is smaller than the sum of its proper divisors (1619710080).

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

691006080 is a wasteful number, since it uses less digits than its factorization.

691006080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 691006080 is about 26286.9945029857. The cubic root of 691006080 is about 884.0848658995.

The spelling of 691006080 in words is "six hundred ninety-one million, six thousand, eighty".