520346644 has 6 divisors (see below), whose sum is σ = 910606634. Its totient is φ = 260173320.

The previous prime is 520346609. The next prime is 520346663. The reversal of 520346644 is 446643025.

It can be written as a sum of positive squares in only one way, i.e., 488852100 + 31494544 = 22110^2 + 5612^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65043327 + ... + 65043334.

Almost surely, 2^520346644 is an apocalyptic number.

It is an amenable number.

520346644 is a deficient number, since it is larger than the sum of its proper divisors (390259990).

520346644 is a wasteful number, since it uses less digits than its factorization.

520346644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130086665 (or 130086663 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 520346644 is about 22811.1079082100. The cubic root of 520346644 is about 804.3237992653.

Adding to 520346644 its reverse (446643025), we get a palindrome (966989669).

The spelling of 520346644 in words is "five hundred twenty million, three hundred forty-six thousand, six hundred forty-four".