521326890 has 96 divisors (see below), whose sum is σ = 1586946816. Its totient is φ = 116248320.

The previous prime is 521326889. The next prime is 521326903. The reversal of 521326890 is 98623125.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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, 15739 + ... + 35921.

It is an arithmetic number, because the mean of its divisors is an integer number (16530696).

Almost surely, 2^521326890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521326890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793473408).

521326890 is an abundant number, since it is smaller than the sum of its proper divisors (1065619926).

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

521326890 is a wasteful number, since it uses less digits than its factorization.

521326890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20244 (or 20241 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 521326890 is about 22832.5839536396. The cubic root of 521326890 is about 804.8285529202.

The spelling of 521326890 in words is "five hundred twenty-one million, three hundred twenty-six thousand, eight hundred ninety".