81770346 has 24 divisors (see below), whose sum is σ = 202479264. Its totient is φ = 23362920.

The previous prime is 81770329. The next prime is 81770399. The reversal of 81770346 is 64307718.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81770346.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 324360 + ... + 324611.

It is an arithmetic number, because the mean of its divisors is an integer number (8436636).

Almost surely, 2^81770346 is an apocalyptic number.

81770346 is an abundant number, since it is smaller than the sum of its proper divisors (120708918).

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

81770346 is a wasteful number, since it uses less digits than its factorization.

81770346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648986 (or 648983 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 81770346 is about 9042.6957263860. The cubic root of 81770346 is about 434.0421890507.

The spelling of 81770346 in words is "eighty-one million, seven hundred seventy thousand, three hundred forty-six".