81079770 has 32 divisors (see below), whose sum is σ = 196525440. Its totient is φ = 21406400.

The previous prime is 81079753. The next prime is 81079861. The reversal of 81079770 is 7797018.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10350 + ... + 16409.

It is an arithmetic number, because the mean of its divisors is an integer number (6141420).

Almost surely, 2^81079770 is an apocalyptic number.

81079770 is an abundant number, since it is smaller than the sum of its proper divisors (115445670).

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

81079770 is a wasteful number, since it uses less digits than its factorization.

81079770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26870.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 81079770 is about 9004.4305761109. The cubic root of 81079770 is about 432.8168593660.

The spelling of 81079770 in words is "eighty-one million, seventy-nine thousand, seven hundred seventy".