523640040 has 128 divisors (see below), whose sum is σ = 1958584320. Its totient is φ = 108806400.

The previous prime is 523640027. The next prime is 523640081. The reversal of 523640040 is 40046325.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 19096 + ... + 37575.

It is an arithmetic number, because the mean of its divisors is an integer number (15301440).

Almost surely, 2^523640040 is an apocalyptic number.

It is an amenable number.

523640040 is an abundant number, since it is smaller than the sum of its proper divisors (1434944280).

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

523640040 is a wasteful number, since it uses less digits than its factorization.

523640040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56703 (or 56699 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 523640040 is about 22883.1824709764. The cubic root of 523640040 is about 806.0171497520.

Adding to 523640040 its reverse (40046325), we get a palindrome (563686365).

The spelling of 523640040 in words is "five hundred twenty-three million, six hundred forty thousand, forty".