691461400 has 144 divisors (see below), whose sum is σ = 1952888400. Its totient is φ = 222996480.

The previous prime is 691461377. The next prime is 691461401. The reversal of 691461400 is 4164196.

691461400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691461401) 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, 403746 + ... + 405454.

It is an arithmetic number, because the mean of its divisors is an integer number (13561725).

Almost surely, 2^691461400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691461400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976444200).

691461400 is an abundant number, since it is smaller than the sum of its proper divisors (1261427000).

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

691461400 is a wasteful number, since it uses less digits than its factorization.

691461400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 691461400 is about 26295.6536332528. The cubic root of 691461400 is about 884.2790046346.

The spelling of 691461400 in words is "six hundred ninety-one million, four hundred sixty-one thousand, four hundred".