81080775 has 36 divisors (see below), whose sum is σ = 146134248. Its totient is φ = 42972480.

The previous prime is 81080749. The next prime is 81080807. The reversal of 81080775 is 57708018.

It is not a de Polignac number, because 81080775 - 2¹⁴ = 81064391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 37884 + ... + 39966.

Almost surely, 2^81080775 is an apocalyptic number.

81080775 is a deficient number, since it is larger than the sum of its proper divisors (65053473).

81080775 is a wasteful number, since it uses less digits than its factorization.

81080775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272 (or 2264 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 81080775 is about 9004.4863817988. The cubic root of 81080775 is about 432.8186476426.

The spelling of 81080775 in words is "eighty-one million, eighty thousand, seven hundred seventy-five".