81162785 has 8 divisors (see below), whose sum is σ = 106249536. Its totient is φ = 59027440.

The previous prime is 81162761. The next prime is 81162797. The reversal of 81162785 is 58726118.

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

It is not a de Polignac number, because 81162785 - 2¹⁰ = 81161761 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737789 + ... + 737898.

It is an arithmetic number, because the mean of its divisors is an integer number (13281192).

Almost surely, 2^81162785 is an apocalyptic number.

It is an amenable number.

81162785 is a deficient number, since it is larger than the sum of its proper divisors (25086751).

81162785 is a wasteful number, since it uses less digits than its factorization.

81162785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475703.

The product of its digits is 26880, while the sum is 38.

The square root of 81162785 is about 9009.0390719543. The cubic root of 81162785 is about 432.9645247904.

It can be divided in two parts, 8116 and 2785, that added together give a palindrome (10901).

The spelling of 81162785 in words is "eighty-one million, one hundred sixty-two thousand, seven hundred eighty-five".