728122091990 has 8 divisors (see below), whose sum is σ = 1310619765600. Its totient is φ = 291248836792.

The previous prime is 728122091971. The next prime is 728122092023. The reversal of 728122091990 is 99190221827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36406104590 + ... + 36406104609.

It is an arithmetic number, because the mean of its divisors is an integer number (163827470700).

Almost surely, 2^728122091990 is an apocalyptic number.

728122091990 is a deficient number, since it is larger than the sum of its proper divisors (582497673610).

728122091990 is a wasteful number, since it uses less digits than its factorization.

728122091990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72812209206.

The product of its (nonzero) digits is 326592, while the sum is 50.

The spelling of 728122091990 in words is "seven hundred twenty-eight billion, one hundred twenty-two million, ninety-one thousand, nine hundred ninety".