264403440 has 480 divisors, whose sum is σ = 1104929280. Its totient is φ = 57480192.

The previous prime is 264403429. The next prime is 264403453. The reversal of 264403440 is 44304462.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3946287 + ... + 3946353.

It is an arithmetic number, because the mean of its divisors is an integer number (2301936).

Almost surely, 2^264403440 is an apocalyptic number.

264403440 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 264403440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552464640).

264403440 is an abundant number, since it is smaller than the sum of its proper divisors (840525840).

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

264403440 is a wasteful number, since it uses less digits than its factorization.

264403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 264403440 is about 16260.4870775755. The cubic root of 264403440 is about 641.8334793904.

The spelling of 264403440 in words is "two hundred sixty-four million, four hundred three thousand, four hundred forty".