691632 has 40 divisors (see below), whose sum is σ = 1986480. Its totient is φ = 230400.

The previous prime is 691631. The next prime is 691637. The reversal of 691632 is 236196.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 691596 and 691605.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691632.

It is not an unprimeable number, because it can be changed into a prime (691631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 1232.

It is an arithmetic number, because the mean of its divisors is an integer number (49662).

2⁶⁹¹⁶³² is an apocalyptic number.

It is an amenable number.

691632 is an abundant number, since it is smaller than the sum of its proper divisors (1294848).

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

691632 is a wasteful number, since it uses less digits than its factorization.

691632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618 (or 1606 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 691632 is about 831.6441546719. The cubic root of 691632 is about 88.4351722887.

The spelling of 691632 in words is "six hundred ninety-one thousand, six hundred thirty-two".