691699920 has 40 divisors (see below), whose sum is σ = 2144270496. Its totient is φ = 184453248.

The previous prime is 691699913. The next prime is 691699949. The reversal of 691699920 is 29996196.

691699920 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 1440802 + ... + 1441281.

Almost surely, 2^691699920 is an apocalyptic number.

691699920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691699920 is an abundant number, since it is smaller than the sum of its proper divisors (1452570576).

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

691699920 is a wasteful number, since it uses less digits than its factorization.

691699920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882099 (or 2882093 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 51.

The square root of 691699920 is about 26300.1885924797. The cubic root of 691699920 is about 884.3806704594.

The spelling of 691699920 in words is "six hundred ninety-one million, six hundred ninety-nine thousand, nine hundred twenty".