521640002 has 32 divisors (see below), whose sum is σ = 903571200. Its totient is φ = 223711488.

The previous prime is 521639999. The next prime is 521640013. The reversal of 521640002 is 200046125.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27449 + ... + 42387.

It is an arithmetic number, because the mean of its divisors is an integer number (28236600).

Almost surely, 2^521640002 is an apocalyptic number.

521640002 is a deficient number, since it is larger than the sum of its proper divisors (381931198).

521640002 is a wasteful number, since it uses less digits than its factorization.

521640002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15050.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 521640002 is about 22839.4396165930. The cubic root of 521640002 is about 804.9896489288.

Adding to 521640002 its reverse (200046125), we get a palindrome (721686127).

The spelling of 521640002 in words is "five hundred twenty-one million, six hundred forty thousand, two".