81875582 has 8 divisors (see below), whose sum is σ = 123281136. Its totient is φ = 40781872.

The previous prime is 81875543. The next prime is 81875597. The reversal of 81875582 is 28557818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81875582² = 13407221855677448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77303 + ... + 78354.

It is an arithmetic number, because the mean of its divisors is an integer number (15410142).

Almost surely, 2^81875582 is an apocalyptic number.

81875582 is a deficient number, since it is larger than the sum of its proper divisors (41405554).

81875582 is a wasteful number, since it uses less digits than its factorization.

81875582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155922.

The product of its digits is 179200, while the sum is 44.

The square root of 81875582 is about 9048.5126954655. The cubic root of 81875582 is about 434.2283090200.

The spelling of 81875582 in words is "eighty-one million, eight hundred seventy-five thousand, five hundred eighty-two".