264403440236440 has 192 divisors, whose sum is σ = 664851262420800. Its totient is φ = 94293886427136.

The previous prime is 264403440236431. The next prime is 264403440236471. The reversal of 264403440236440 is 44632044304462.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3941638821 + ... + 3941705899.

It is an arithmetic number, because the mean of its divisors is an integer number (3462766991775).

Almost surely, 2^{264403440236440} is an apocalyptic number.

264403440236440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 264403440236440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332425631210400).

264403440236440 is an abundant number, since it is smaller than the sum of its proper divisors (400447822184360).

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

264403440236440 is a wasteful number, since it uses less digits than its factorization.

264403440236440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83202 (or 83179 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 46.

The spelling of 264403440236440 in words is "two hundred sixty-four trillion, four hundred three billion, four hundred forty million, two hundred thirty-six thousand, four hundred forty".