28891319990 has 16 divisors (see below), whose sum is σ = 56004712848. Its totient is φ = 10667564256.

The previous prime is 28891319983. The next prime is 28891319999. The reversal of 28891319990 is 9991319882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891319999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111120332 + ... + 111120591.

It is an arithmetic number, because the mean of its divisors is an integer number (3500294553).

Almost surely, 2^28891319990 is an apocalyptic number.

28891319990 is a deficient number, since it is larger than the sum of its proper divisors (27113392858).

28891319990 is a wasteful number, since it uses less digits than its factorization.

28891319990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222240943.

The product of its (nonzero) digits is 2519424, while the sum is 59.

The spelling of 28891319990 in words is "twenty-eight billion, eight hundred ninety-one million, three hundred nineteen thousand, nine hundred ninety".