81075456 has 216 divisors, whose sum is σ = 292079424. Its totient is φ = 21012480.

The previous prime is 81075443. The next prime is 81075469. The reversal of 81075456 is 65457018.

81075456 is a `hidden beast` number, since 8 + 107 + 545 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (81075443) and next prime (81075469).

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

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 81075456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177180 + ... + 177636.

Almost surely, 2^81075456 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 81075456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146039712).

81075456 is an abundant number, since it is smaller than the sum of its proper divisors (211003968).

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

81075456 is a wasteful number, since it uses less digits than its factorization.

81075456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 81075456 is about 9004.1910241842. The cubic root of 81075456 is about 432.8091829545.

The spelling of 81075456 in words is "eighty-one million, seventy-five thousand, four hundred fifty-six".