28709101512 has 320 divisors, whose sum is σ = 99525888000. Its totient is φ = 7529034240.

The previous prime is 28709101439. The next prime is 28709101537. The reversal of 28709101512 is 21510190782.

It is a happy number.

It is a super-2 number, since 2×28709101512² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 11261614 + ... + 11264162.

It is an arithmetic number, because the mean of its divisors is an integer number (311018400).

Almost surely, 2^28709101512 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 28709101512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49762944000).

28709101512 is an abundant number, since it is smaller than the sum of its proper divisors (70816786488).

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

28709101512 is a wasteful number, since it uses less digits than its factorization.

28709101512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The spelling of 28709101512 in words is "twenty-eight billion, seven hundred nine million, one hundred one thousand, five hundred twelve".