523940640 has 192 divisors, whose sum is σ = 1717148160. Its totient is φ = 134184960.

The previous prime is 523940639. The next prime is 523940653. The reversal of 523940640 is 46049325.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1554552 + ... + 1554888.

It is an arithmetic number, because the mean of its divisors is an integer number (8943480).

Almost surely, 2^523940640 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 523940640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (858574080).

523940640 is an abundant number, since it is smaller than the sum of its proper divisors (1193207520).

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

523940640 is a wasteful number, since it uses less digits than its factorization.

523940640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 523940640 is about 22889.7496709772. The cubic root of 523940640 is about 806.1713539055.

Adding to 523940640 its reverse (46049325), we get a palindrome (569989965).

The spelling of 523940640 in words is "five hundred twenty-three million, nine hundred forty thousand, six hundred forty".