40868620640 has 72 divisors (see below), whose sum is σ = 98650978272. Its totient is φ = 15999491840.

The previous prime is 40868620613. The next prime is 40868620657. The reversal of 40868620640 is 4602686804.

It is a junction number, because it is equal to n+sod(n) for n = 40868620591 and 40868620600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295625 + ... + 411255.

It is an arithmetic number, because the mean of its divisors is an integer number (1370152476).

Almost surely, 2^40868620640 is an apocalyptic number.

40868620640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40868620640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49325489136).

40868620640 is an abundant number, since it is smaller than the sum of its proper divisors (57782357632).

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

40868620640 is a wasteful number, since it uses less digits than its factorization.

40868620640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115740 (or 115685 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 40868620640 in words is "forty billion, eight hundred sixty-eight million, six hundred twenty thousand, six hundred forty".