81106770 has 32 divisors (see below), whose sum is σ = 197007552. Its totient is φ = 21367232.

The previous prime is 81106741. The next prime is 81106771. The reversal of 81106770 is 7760118.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (81106771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13797 + ... + 18776.

It is an arithmetic number, because the mean of its divisors is an integer number (6156486).

Almost surely, 2^81106770 is an apocalyptic number.

81106770 is an abundant number, since it is smaller than the sum of its proper divisors (115900782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81106770 is a wasteful number, since it uses less digits than its factorization.

81106770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32666.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 81106770 is about 9005.9297132500. The cubic root of 81106770 is about 432.8648974824.

Adding to 81106770 its reverse (7760118), we get a palindrome (88866888).

The spelling of 81106770 in words is "eighty-one million, one hundred six thousand, seven hundred seventy".