691384320 has 468 divisors, whose sum is σ = 2719149888. Its totient is φ = 162201600.

The previous prime is 691384313. The next prime is 691384321. The reversal of 691384320 is 23483196.

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 (691384321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22302705 + ... + 22302735.

Almost surely, 2^691384320 is an apocalyptic number.

691384320 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 691384320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1359574944).

691384320 is an abundant number, since it is smaller than the sum of its proper divisors (2027765568).

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

691384320 is a wasteful number, since it uses less digits than its factorization.

691384320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 691384320 is about 26294.1879509522. The cubic root of 691384320 is about 884.2461453607.

The spelling of 691384320 in words is "six hundred ninety-one million, three hundred eighty-four thousand, three hundred twenty".