81263075 has 12 divisors (see below), whose sum is σ = 104241840. Its totient is φ = 62768160.

The previous prime is 81263029. The next prime is 81263081. The reversal of 81263075 is 57036218.

It is a happy number.

It is not a de Polignac number, because 81263075 - 2²⁰ = 80214499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55319 + ... + 56768.

It is an arithmetic number, because the mean of its divisors is an integer number (8686820).

Almost surely, 2^81263075 is an apocalyptic number.

81263075 is a deficient number, since it is larger than the sum of its proper divisors (22978765).

81263075 is a wasteful number, since it uses less digits than its factorization.

81263075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112126 (or 112121 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81263075 is about 9014.6034299907. The cubic root of 81263075 is about 433.1427844014.

The spelling of 81263075 in words is "eighty-one million, two hundred sixty-three thousand, seventy-five".