691470463920 has 80 divisors (see below), whose sum is σ = 2144286527712. Its totient is φ = 184329492480.

The previous prime is 691470463897. The next prime is 691470463927. The reversal of 691470463920 is 29364074196.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (691470463927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220890 + ... + 1196550.

Almost surely, 2^691470463920 is an apocalyptic number.

691470463920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691470463920 is an abundant number, since it is smaller than the sum of its proper divisors (1452816063792).

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

691470463920 is a wasteful number, since it uses less digits than its factorization.

691470463920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978630 (or 978624 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 691470463920 in words is "six hundred ninety-one billion, four hundred seventy million, four hundred sixty-three thousand, nine hundred twenty".