660040430 has 64 divisors (see below), whose sum is σ = 1491471360. Its totient is φ = 205058304.

The previous prime is 660040399. The next prime is 660040439. The reversal of 660040430 is 34040066.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 660040396 and 660040405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660040439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19802 + ... + 41378.

It is an arithmetic number, because the mean of its divisors is an integer number (23304240).

Almost surely, 2^660040430 is an apocalyptic number.

660040430 is an abundant number, since it is smaller than the sum of its proper divisors (831430930).

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

660040430 is a wasteful number, since it uses less digits than its factorization.

660040430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21633.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 660040430 is about 25691.2520130880. The cubic root of 660040430 is about 870.6765469029.

Adding to 660040430 its reverse (34040066), we get a palindrome (694080496).

The spelling of 660040430 in words is "six hundred sixty million, forty thousand, four hundred thirty".