523504640 has 88 divisors (see below), whose sum is σ = 1277819280. Its totient is φ = 205733888.

The previous prime is 523504637. The next prime is 523504643. The reversal of 523504640 is 46405325.

523504640 = T₄₅₅ + T₄₅₆ + ... + T₁₄₇₈.

It is an interprime number because it is at equal distance from previous prime (523504637) and next prime (523504643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523504643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301214 + ... + 302946.

Almost surely, 2^523504640 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 523504640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638909640).

523504640 is an abundant number, since it is smaller than the sum of its proper divisors (754314640).

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

523504640 is a wasteful number, since it uses less digits than its factorization.

523504640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 523504640 is about 22880.2237751295. The cubic root of 523504640 is about 805.9476719163.

Adding to 523504640 its reverse (46405325), we get a palindrome (569909965).

The spelling of 523504640 in words is "five hundred twenty-three million, five hundred four thousand, six hundred forty".