691960320 has 400 divisors, whose sum is σ = 2566764288. Its totient is φ = 178053120.

The previous prime is 691960307. The next prime is 691960327. The reversal of 691960320 is 23069196.

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 (691960327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9745885 + ... + 9745955.

Almost surely, 2^691960320 is an apocalyptic number.

691960320 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 691960320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283382144).

691960320 is an abundant number, since it is smaller than the sum of its proper divisors (1874803968).

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

691960320 is an equidigital number, since it uses as much as digits as its factorization.

691960320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 691960320 is about 26305.1386614859. The cubic root of 691960320 is about 884.4916356467.

The spelling of 691960320 in words is "six hundred ninety-one million, nine hundred sixty thousand, three hundred twenty".