691115040 has 576 divisors, whose sum is σ = 3079544832. Its totient is φ = 136857600.

The previous prime is 691115039. The next prime is 691115083. The reversal of 691115040 is 40511196.

It is a junction number, because it is equal to n+sod(n) for n = 691114995 and 691115013.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2550105 + ... + 2550375.

It is an arithmetic number, because the mean of its divisors is an integer number (5346432).

Almost surely, 2^691115040 is an apocalyptic number.

691115040 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 691115040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1539772416).

691115040 is an abundant number, since it is smaller than the sum of its proper divisors (2388429792).

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

691115040 is a wasteful number, since it uses less digits than its factorization.

691115040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 691115040 is about 26289.0669290487. The cubic root of 691115040 is about 884.1313318796.

The spelling of 691115040 in words is "six hundred ninety-one million, one hundred fifteen thousand, forty".