28351918080 has 468 divisors, whose sum is σ = 102532906632. Its totient is φ = 7524679680.

The previous prime is 28351918073. The next prime is 28351918129. The reversal of 28351918080 is 8081915382.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 134369175 + ... + 134369385.

Almost surely, 2^28351918080 is an apocalyptic number.

28351918080 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 28351918080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51266453316).

28351918080 is an abundant number, since it is smaller than the sum of its proper divisors (74180988552).

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

28351918080 is an frugal number, since it uses more digits than its factorization.

28351918080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 28351918080 in words is "twenty-eight billion, three hundred fifty-one million, nine hundred eighteen thousand, eighty".