28891003420812 has 192 divisors, whose sum is σ = 75202882546176. Its totient is φ = 8575725312000.

The previous prime is 28891003420793. The next prime is 28891003420901. The reversal of 28891003420812 is 21802430019882.

It is a super-2 number, since 2×28891003420812² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3062754048 + ... + 3062763480.

It is an arithmetic number, because the mean of its divisors is an integer number (391681679928).

Almost surely, 2^{28891003420812} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28891003420812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37601441273088).

28891003420812 is an abundant number, since it is smaller than the sum of its proper divisors (46311879125364).

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

28891003420812 is a wasteful number, since it uses less digits than its factorization.

28891003420812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15080 (or 15078 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 28891003420812 in words is "twenty-eight trillion, eight hundred ninety-one billion, three million, four hundred twenty thousand, eight hundred twelve".