40008720540 has 48 divisors (see below), whose sum is σ = 113112050688. Its totient is φ = 10565408064.

The previous prime is 40008720539. The next prime is 40008720541. The reversal of 40008720540 is 4502780004.

It is an interprime number because it is at equal distance from previous prime (40008720539) and next prime (40008720541).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 40008720498 and 40008720507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40008720541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3230772 + ... + 3243131.

It is an arithmetic number, because the mean of its divisors is an integer number (2356501056).

Almost surely, 2^40008720540 is an apocalyptic number.

It is an amenable number.

40008720540 is an abundant number, since it is smaller than the sum of its proper divisors (73103330148).

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

40008720540 is a wasteful number, since it uses less digits than its factorization.

40008720540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6474018 (or 6474016 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The spelling of 40008720540 in words is "forty billion, eight million, seven hundred twenty thousand, five hundred forty".