38220181840 has 40 divisors (see below), whose sum is σ = 88960065120. Its totient is φ = 15271188096.

The previous prime is 38220181817. The next prime is 38220181841. The reversal of 38220181840 is 4818102283.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 38220181840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38220181841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190810 + ... + 335929.

It is an arithmetic number, because the mean of its divisors is an integer number (2224001628).

Almost surely, 2^38220181840 is an apocalyptic number.

It is an amenable number.

38220181840 is an abundant number, since it is smaller than the sum of its proper divisors (50739883280).

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

38220181840 is a wasteful number, since it uses less digits than its factorization.

38220181840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527659 (or 527653 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The spelling of 38220181840 in words is "thirty-eight billion, two hundred twenty million, one hundred eighty-one thousand, eight hundred forty".