81741930 has 32 divisors (see below), whose sum is σ = 200358144. Its totient is φ = 21333696.

The previous prime is 81741929. The next prime is 81741941. The reversal of 81741930 is 3914718.

It is a junction number, because it is equal to n+sod(n) for n = 81741891 and 81741900.

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, 27577 + ... + 30396.

It is an arithmetic number, because the mean of its divisors is an integer number (6261192).

Almost surely, 2^81741930 is an apocalyptic number.

81741930 is an abundant number, since it is smaller than the sum of its proper divisors (118616214).

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

81741930 is a wasteful number, since it uses less digits than its factorization.

81741930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58030.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81741930 is about 9041.1243769788. The cubic root of 81741930 is about 433.9919052480.

The spelling of 81741930 in words is "eighty-one million, seven hundred forty-one thousand, nine hundred thirty".