28709123976 has 128 divisors (see below), whose sum is σ = 87977030400. Its totient is φ = 8618088960.

The previous prime is 28709123969. The next prime is 28709124001. The reversal of 28709123976 is 67932190782.

It is a super-5 number, since 5×28709123976⁵ (a number of 53 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 31 ways as a sum of consecutive naturals, for example, 9556 + ... + 239811.

It is an arithmetic number, because the mean of its divisors is an integer number (687320550).

Almost surely, 2^28709123976 is an apocalyptic number.

28709123976 is a gapful number since it is divisible by the number (26) 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 28709123976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43988515200).

28709123976 is an abundant number, since it is smaller than the sum of its proper divisors (59267906424).

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

28709123976 is a wasteful number, since it uses less digits than its factorization.

28709123976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249436 (or 249426 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 28709123976 in words is "twenty-eight billion, seven hundred nine million, one hundred twenty-three thousand, nine hundred seventy-six".