691620480 has 192 divisors, whose sum is σ = 2405894400. Its totient is φ = 183072768.

The previous prime is 691620467. The next prime is 691620481. The reversal of 691620480 is 84026196.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (691620481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 961561 + ... + 962279.

It is an arithmetic number, because the mean of its divisors is an integer number (12530700).

Almost surely, 2^691620480 is an apocalyptic number.

691620480 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 691620480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1202947200).

691620480 is an abundant number, since it is smaller than the sum of its proper divisors (1714273920).

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

691620480 is a wasteful number, since it uses less digits than its factorization.

691620480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911 (or 896 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 691620480 is about 26298.6782937850. The cubic root of 691620480 is about 884.3468128630.

The spelling of 691620480 in words is "six hundred ninety-one million, six hundred twenty thousand, four hundred eighty".