81242675 has 6 divisors (see below), whose sum is σ = 100740948. Its totient is φ = 64994120.

The previous prime is 81242653. The next prime is 81242687. The reversal of 81242675 is 57624218.

It is not a de Polignac number, because 81242675 - 2⁶ = 81242611 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1624829 + ... + 1624878.

It is an arithmetic number, because the mean of its divisors is an integer number (16790158).

Almost surely, 2^81242675 is an apocalyptic number.

81242675 is a deficient number, since it is larger than the sum of its proper divisors (19498273).

81242675 is a wasteful number, since it uses less digits than its factorization.

81242675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249717 (or 3249712 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 81242675 is about 9013.4718616080. The cubic root of 81242675 is about 433.1065364815.

The spelling of 81242675 in words is "eighty-one million, two hundred forty-two thousand, six hundred seventy-five".