520421748 has 144 divisors (see below), whose sum is σ = 1631980224. Its totient is φ = 127196160.

The previous prime is 520421717. The next prime is 520421749. The reversal of 520421748 is 847124025.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520421749) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107590 + ... + 112322.

It is an arithmetic number, because the mean of its divisors is an integer number (11333196).

Almost surely, 2^520421748 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520421748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815990112).

520421748 is an abundant number, since it is smaller than the sum of its proper divisors (1111558476).

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

520421748 is a wasteful number, since it uses less digits than its factorization.

520421748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 520421748 is about 22812.7540643387. The cubic root of 520421748 is about 804.3624946422.

The spelling of 520421748 in words is "five hundred twenty million, four hundred twenty-one thousand, seven hundred forty-eight".