28405715712 has 144 divisors (see below), whose sum is σ = 82741381632. Its totient is φ = 8579829760.

The previous prime is 28405715707. The next prime is 28405715747. The reversal of 28405715712 is 21751750482.

It is a super-2 number, since 2×28405715712² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2672713 + ... + 2683319.

It is an arithmetic number, because the mean of its divisors is an integer number (574592928).

Almost surely, 2^28405715712 is an apocalyptic number.

28405715712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28405715712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41370690816).

28405715712 is an abundant number, since it is smaller than the sum of its proper divisors (54335665920).

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

28405715712 is a wasteful number, since it uses less digits than its factorization.

28405715712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10954 (or 10940 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The spelling of 28405715712 in words is "twenty-eight billion, four hundred five million, seven hundred fifteen thousand, seven hundred twelve".