40729680639 has 36 divisors (see below), whose sum is σ = 62717990296. Its totient is φ = 25465114368.

The previous prime is 40729680631. The next prime is 40729680653. The reversal of 40729680639 is 93608692704.

It is a happy number.

It is not a de Polignac number, because 40729680639 - 2³ = 40729680631 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40729680631) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 708417 + ... + 763749.

Almost surely, 2^40729680639 is an apocalyptic number.

40729680639 is a deficient number, since it is larger than the sum of its proper divisors (21988309657).

40729680639 is a wasteful number, since it uses less digits than its factorization.

40729680639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55656 (or 55636 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 40729680639 in words is "forty billion, seven hundred twenty-nine million, six hundred eighty thousand, six hundred thirty-nine".