28287161280 has 896 divisors, whose sum is σ = 119091456000. Its totient is φ = 6186958848.

The previous prime is 28287161257. The next prime is 28287161303. The reversal of 28287161280 is 8216178282.

It is a happy number.

28287161280 is a `hidden beast` number, since 2 + 8 + 28 + 7 + 1 + 612 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28287161257) and next prime (28287161303).

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 127 ways as a sum of consecutive naturals, for example, 189846646 + ... + 189846794.

Almost surely, 2^28287161280 is an apocalyptic number.

28287161280 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 28287161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59545728000).

28287161280 is an abundant number, since it is smaller than the sum of its proper divisors (90804294720).

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

28287161280 is a wasteful number, since it uses less digits than its factorization.

28287161280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 28287161280 in words is "twenty-eight billion, two hundred eighty-seven million, one hundred sixty-one thousand, two hundred eighty".