40027640644 has 12 divisors (see below), whose sum is σ = 70287446124. Its totient is φ = 19945513184.

The previous prime is 40027640629. The next prime is 40027640687. The reversal of 40027640644 is 44604672004.

It can be written as a sum of positive squares in 2 ways, for example, as 33943640644 + 6084000000 = 184238^2 + 78000^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17075467 + ... + 17077810.

It is an arithmetic number, because the mean of its divisors is an integer number (5857287177).

Almost surely, 2^40027640644 is an apocalyptic number.

It is an amenable number.

40027640644 is a deficient number, since it is larger than the sum of its proper divisors (30259805480).

40027640644 is a wasteful number, since it uses less digits than its factorization.

40027640644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34153574 (or 34153572 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 37.

The spelling of 40027640644 in words is "forty billion, twenty-seven million, six hundred forty thousand, six hundred forty-four".