691464 has 32 divisors (see below), whose sum is σ = 1768320. Its totient is φ = 225216.

The previous prime is 691463. The next prime is 691489. The reversal of 691464 is 464196.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (691463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822 + ... + 1434.

It is an arithmetic number, because the mean of its divisors is an integer number (55260).

2⁶⁹¹⁴⁶⁴ 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 691464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884160).

691464 is an abundant number, since it is smaller than the sum of its proper divisors (1076856).

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

691464 is a wasteful number, since it uses less digits than its factorization.

691464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 665 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 691464 is about 831.5431437995. The cubic root of 691464 is about 88.4280112974.

The spelling of 691464 in words is "six hundred ninety-one thousand, four hundred sixty-four".