521040870 has 128 divisors (see below), whose sum is σ = 1639342080. Its totient is φ = 115240320.

The previous prime is 521040851. The next prime is 521040889. The reversal of 521040870 is 78040125.

It is an interprime number because it is at equal distance from previous prime (521040851) and next prime (521040889).

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 63 ways as a sum of consecutive naturals, for example, 54144 + ... + 63036.

It is an arithmetic number, because the mean of its divisors is an integer number (12807360).

Almost surely, 2^521040870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521040870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819671040).

521040870 is an abundant number, since it is smaller than the sum of its proper divisors (1118301210).

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

521040870 is a wasteful number, since it uses less digits than its factorization.

521040870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8947 (or 8941 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 521040870 is about 22826.3196770745. The cubic root of 521040870 is about 804.6813393527.

Adding to 521040870 its reverse (78040125), we get a palindrome (599080995).

The spelling of 521040870 in words is "five hundred twenty-one million, forty thousand, eight hundred seventy".