691042560 has 288 divisors, whose sum is σ = 2417479680. Its totient is φ = 167215104.

The previous prime is 691042549. The next prime is 691042579. The reversal of 691042560 is 65240196.

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, 5441217 + ... + 5441343.

Almost surely, 2^691042560 is an apocalyptic number.

691042560 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 691042560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208739840).

691042560 is an abundant number, since it is smaller than the sum of its proper divisors (1726437120).

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

691042560 is a wasteful number, since it uses less digits than its factorization.

691042560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 691042560 is about 26287.6883730769. The cubic root of 691042560 is about 884.1004233354.

The spelling of 691042560 in words is "six hundred ninety-one million, forty-two thousand, five hundred sixty".