691974040 has 32 divisors (see below), whose sum is σ = 1562885280. Its totient is φ = 275732992.

The previous prime is 691974013. The next prime is 691974061. The reversal of 691974040 is 40479196.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 691973984 and 691974002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22369 + ... + 43408.

It is an arithmetic number, because the mean of its divisors is an integer number (48840165).

Almost surely, 2^691974040 is an apocalyptic number.

It is an amenable number.

691974040 is an abundant number, since it is smaller than the sum of its proper divisors (870911240).

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

691974040 is a wasteful number, since it uses less digits than its factorization.

691974040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66051 (or 66047 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 691974040 is about 26305.3994457412. The cubic root of 691974040 is about 884.4974814275.

It can be divided in two parts, 69197 and 4040, that added together give a palindrome (73237).

The spelling of 691974040 in words is "six hundred ninety-one million, nine hundred seventy-four thousand, forty".