28951342920 has 256 divisors, whose sum is σ = 100916928000. Its totient is φ = 7368818688.

The previous prime is 28951342913. The next prime is 28951342921. The reversal of 28951342920 is 2924315982.

28951342920 is a `hidden beast` number, since 2 + 8 + 9 + 513 + 42 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28951342921) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 15325336 + ... + 15327224.

It is an arithmetic number, because the mean of its divisors is an integer number (394206750).

Almost surely, 2^28951342920 is an apocalyptic number.

28951342920 is a gapful number since it is divisible by the number (20) 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 28951342920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50458464000).

28951342920 is an abundant number, since it is smaller than the sum of its proper divisors (71965585080).

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

28951342920 is a wasteful number, since it uses less digits than its factorization.

28951342920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549 (or 2539 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 28951342920 in words is "twenty-eight billion, nine hundred fifty-one million, three hundred forty-two thousand, nine hundred twenty".