81352770 has 32 divisors (see below), whose sum is σ = 199404288. Its totient is φ = 21232128.

The previous prime is 81352763. The next prime is 81352783. The reversal of 81352770 is 7725318.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27439 + ... + 30258.

It is an arithmetic number, because the mean of its divisors is an integer number (6231384).

Almost surely, 2^81352770 is an apocalyptic number.

81352770 is an abundant number, since it is smaller than the sum of its proper divisors (118051518).

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

81352770 is a wasteful number, since it uses less digits than its factorization.

81352770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57754.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 81352770 is about 9019.5770410813. The cubic root of 81352770 is about 433.3020878194.

The spelling of 81352770 in words is "eighty-one million, three hundred fifty-two thousand, seven hundred seventy".