28161869390 has 32 divisors (see below), whose sum is σ = 52032607200. Its totient is φ = 10970352000.

The previous prime is 28161869389. The next prime is 28161869399. The reversal of 28161869390 is 9396816182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161869399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166940 + ... + 290159.

It is an arithmetic number, because the mean of its divisors is an integer number (1626018975).

Almost surely, 2^28161869390 is an apocalyptic number.

28161869390 is a deficient number, since it is larger than the sum of its proper divisors (23870737810).

28161869390 is a wasteful number, since it uses less digits than its factorization.

28161869390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457268.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 28161869390 in words is "twenty-eight billion, one hundred sixty-one million, eight hundred sixty-nine thousand, three hundred ninety".