40128737620 has 12 divisors (see below), whose sum is σ = 84270349044. Its totient is φ = 16051495040.

The previous prime is 40128737611. The next prime is 40128737669. The reversal of 40128737620 is 2673782104.

It can be written as a sum of positive squares in 2 ways, for example, as 30405594384 + 9723143236 = 174372^2 + 98606^2 .

It is a super-2 number, since 2×40128737620² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 1003218421 + ... + 1003218460.

It is an arithmetic number, because the mean of its divisors is an integer number (7022529087).

Almost surely, 2^40128737620 is an apocalyptic number.

It is an amenable number.

40128737620 is an abundant number, since it is smaller than the sum of its proper divisors (44141611424).

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

40128737620 is a wasteful number, since it uses less digits than its factorization.

40128737620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006436890 (or 2006436888 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 40128737620 in words is "forty billion, one hundred twenty-eight million, seven hundred thirty-seven thousand, six hundred twenty".