43640978452 has 6 divisors (see below), whose sum is σ = 76371712298. Its totient is φ = 21820489224.

The previous prime is 43640978431. The next prime is 43640978461. The reversal of 43640978452 is 25487904634.

It can be written as a sum of positive squares in only one way, i.e., 36739688976 + 6901289476 = 191676^2 + 83074^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 43640978452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5455122303 + ... + 5455122310.

Almost surely, 2^43640978452 is an apocalyptic number.

It is an amenable number.

43640978452 is a deficient number, since it is larger than the sum of its proper divisors (32730733846).

43640978452 is a wasteful number, since it uses less digits than its factorization.

43640978452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910244617 (or 10910244615 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 43640978452 in words is "forty-three billion, six hundred forty million, nine hundred seventy-eight thousand, four hundred fifty-two".