264489381620 has 24 divisors (see below), whose sum is σ = 555437607144. Its totient is φ = 105793865856.

The previous prime is 264489381617. The next prime is 264489381641. The reversal of 264489381620 is 26183984462.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39230932624 + 225258448996 = 198068^2 + 474614^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1764242 + ... + 1908278.

It is an arithmetic number, because the mean of its divisors is an integer number (23143233631).

Almost surely, 2^264489381620 is an apocalyptic number.

264489381620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

264489381620 is an abundant number, since it is smaller than the sum of its proper divisors (290948225524).

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

264489381620 is a wasteful number, since it uses less digits than its factorization.

264489381620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235859 (or 235857 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 264489381620 in words is "two hundred sixty-four billion, four hundred eighty-nine million, three hundred eighty-one thousand, six hundred twenty".