40728509811 has 24 divisors (see below), whose sum is σ = 64242784944. Its totient is φ = 24659127360.

The previous prime is 40728509791. The next prime is 40728509831. The reversal of 40728509811 is 11890582704.

40728509811 is a `hidden beast` number, since 40 + 7 + 28 + 509 + 81 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (40728509791) and next prime (40728509831).

It is not a de Polignac number, because 40728509811 - 2⁹ = 40728509299 is a prime.

It is a super-2 number, since 2×40728509811² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40728509831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107616 + ... + 305021.

It is an arithmetic number, because the mean of its divisors is an integer number (2676782706).

Almost surely, 2^40728509811 is an apocalyptic number.

40728509811 is a deficient number, since it is larger than the sum of its proper divisors (23514275133).

40728509811 is a wasteful number, since it uses less digits than its factorization.

40728509811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413651 (or 413648 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 40728509811 in words is "forty billion, seven hundred twenty-eight million, five hundred nine thousand, eight hundred eleven".