201028191981990 has 32 divisors (see below), whose sum is σ = 503444515574016. Its totient is φ = 51276756215520.

The previous prime is 201028191981961. The next prime is 201028191982061. The reversal of 201028191981990 is 99189191820102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145672602196 + ... + 145672603575.

It is an arithmetic number, because the mean of its divisors is an integer number (15732641111688).

Almost surely, 2^{201028191981990} is an apocalyptic number.

201028191981990 is an abundant number, since it is smaller than the sum of its proper divisors (302416323592026).

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

201028191981990 is a wasteful number, since it uses less digits than its factorization.

201028191981990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291345205804.

The product of its (nonzero) digits is 1679616, while the sum is 60.

The spelling of 201028191981990 in words is "two hundred one trillion, twenty-eight billion, one hundred ninety-one million, nine hundred eighty-one thousand, nine hundred ninety".