691964220 has 24 divisors (see below), whose sum is σ = 1937499984. Its totient is φ = 184523776.

The previous prime is 691964219. The next prime is 691964281. The reversal of 691964220 is 22469196.

691964220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5766309 + ... + 5766428.

It is an arithmetic number, because the mean of its divisors is an integer number (80729166).

Almost surely, 2^691964220 is an apocalyptic number.

691964220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691964220 is an abundant number, since it is smaller than the sum of its proper divisors (1245535764).

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

691964220 is a wasteful number, since it uses less digits than its factorization.

691964220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532749 (or 11532747 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 691964220 is about 26305.2127913841. The cubic root of 691964220 is about 884.4932973561.

The spelling of 691964220 in words is "six hundred ninety-one million, nine hundred sixty-four thousand, two hundred twenty".