81270828 has 72 divisors (see below), whose sum is σ = 218137920. Its totient is φ = 25440480.

The previous prime is 81270823. The next prime is 81270859. The reversal of 81270828 is 82807218.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 81270792 and 81270801.

It is not an unprimeable number, because it can be changed into a prime (81270821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89151 + ... + 90057.

Almost surely, 2^81270828 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 81270828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109068960).

81270828 is an abundant number, since it is smaller than the sum of its proper divisors (136867092).

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

81270828 is a wasteful number, since it uses less digits than its factorization.

81270828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 81270828 is about 9015.0334441975. The cubic root of 81270828 is about 433.1565587969.

The spelling of 81270828 in words is "eighty-one million, two hundred seventy thousand, eight hundred twenty-eight".