623531440040 has 32 divisors (see below), whose sum is σ = 1403050778280. Its totient is φ = 249393902592.

The previous prime is 623531440019. The next prime is 623531440067. The reversal of 623531440040 is 40044135326.

It can be written as a sum of positive squares in 4 ways, for example, as 608833757284 + 14697682756 = 780278^2 + 121234^2 .

It is a super-2 number, since 2×623531440040² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 623531439979 and 623531440006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36269 + ... + 1117308.

Almost surely, 2^623531440040 is an apocalyptic number.

It is an amenable number.

623531440040 is an abundant number, since it is smaller than the sum of its proper divisors (779519338240).

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

623531440040 is a wasteful number, since it uses less digits than its factorization.

623531440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167101 (or 1167097 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 623531440040 its reverse (40044135326), we get a palindrome (663575575366).

The spelling of 623531440040 in words is "six hundred twenty-three billion, five hundred thirty-one million, four hundred forty thousand, forty".