28720028820071 has 16 divisors (see below), whose sum is σ = 28885275786240. Its totient is φ = 28555216435200.

The previous prime is 28720028820059. The next prime is 28720028820139. The reversal of 28720028820071 is 17002882002782.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28720028820071 is a prime.

It is a super-4 number, since 4×28720028820071⁴ (a number of 55 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28720028819998 and 28720028820025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720028810071) 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, 881534060 + ... + 881566638.

It is an arithmetic number, because the mean of its divisors is an integer number (1805329736640).

Almost surely, 2^{28720028820071} is an apocalyptic number.

28720028820071 is a deficient number, since it is larger than the sum of its proper divisors (165246966169).

28720028820071 is a wasteful number, since it uses less digits than its factorization.

28720028820071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39094.

The product of its (nonzero) digits is 401408, while the sum is 47.

The spelling of 28720028820071 in words is "twenty-eight trillion, seven hundred twenty billion, twenty-eight million, eight hundred twenty thousand, seventy-one".