43312454640 has 480 divisors, whose sum is σ = 181976436096. Its totient is φ = 8987811840.

The previous prime is 43312454639. The next prime is 43312454687. The reversal of 43312454640 is 4645421334.

43312454640 is a `hidden beast` number, since 4 + 3 + 3 + 1 + 2 + 4 + 5 + 4 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 43312454595 and 43312454604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3991302 + ... + 4002138.

Almost surely, 2^43312454640 is an apocalyptic number.

43312454640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43312454640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90988218048).

43312454640 is an abundant number, since it is smaller than the sum of its proper divisors (138663981456).

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

43312454640 is a wasteful number, since it uses less digits than its factorization.

43312454640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10937 (or 10928 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 43312454640 its reverse (4645421334), we get a palindrome (47957875974).

The spelling of 43312454640 in words is "forty-three billion, three hundred twelve million, four hundred fifty-four thousand, six hundred forty".