43640695956 has 96 divisors (see below), whose sum is σ = 119716724736. Its totient is φ = 12198384000.

The previous prime is 43640695951. The next prime is 43640695961. The reversal of 43640695956 is 65959604634.

It is an interprime number because it is at equal distance from previous prime (43640695951) and next prime (43640695961).

It is a junction number, because it is equal to n+sod(n) for n = 43640695896 and 43640695905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43640695951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2584461 + ... + 2601291.

It is an arithmetic number, because the mean of its divisors is an integer number (1247049216).

Almost surely, 2^43640695956 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 43640695956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59858362368).

43640695956 is an abundant number, since it is smaller than the sum of its proper divisors (76076028780).

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

43640695956 is a wasteful number, since it uses less digits than its factorization.

43640695956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18373 (or 18371 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 57.

The spelling of 43640695956 in words is "forty-three billion, six hundred forty million, six hundred ninety-five thousand, nine hundred fifty-six".