691703040 has 144 divisors (see below), whose sum is σ = 2524814208. Its totient is φ = 158097408.

The previous prime is 691703029. The next prime is 691703063. The reversal of 691703040 is 40307196.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 691702989 and 691703007.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14014 + ... + 39746.

It is an arithmetic number, because the mean of its divisors is an integer number (17533432).

Almost surely, 2^691703040 is an apocalyptic number.

691703040 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 691703040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1262407104).

691703040 is an abundant number, since it is smaller than the sum of its proper divisors (1833111168).

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

691703040 is a wasteful number, since it uses less digits than its factorization.

691703040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25764 (or 25750 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 691703040 is about 26300.2479075768. The cubic root of 691703040 is about 884.3820001610.

The spelling of 691703040 in words is "six hundred ninety-one million, seven hundred three thousand, forty".