28181920002 has 16 divisors (see below), whose sum is σ = 56366244480. Its totient is φ = 9393572592.

The previous prime is 28181919977. The next prime is 28181920003. The reversal of 28181920002 is 20002918182.

It is a super-2 number, since 2×28181920002² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28181920003) 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, 76023 + ... + 249285.

It is an arithmetic number, because the mean of its divisors is an integer number (3522890280).

Almost surely, 2^28181920002 is an apocalyptic number.

28181920002 is an abundant number, since it is smaller than the sum of its proper divisors (28184324478).

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

28181920002 is a wasteful number, since it uses less digits than its factorization.

28181920002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200377.

The product of its (nonzero) digits is 4608, while the sum is 33.

The spelling of 28181920002 in words is "twenty-eight billion, one hundred eighty-one million, nine hundred twenty thousand, two".