81740258 has 8 divisors (see below), whose sum is σ = 122681280. Its totient is φ = 40846500.

The previous prime is 81740249. The next prime is 81740287. The reversal of 81740258 is 85204718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7118 + ... + 14633.

It is an arithmetic number, because the mean of its divisors is an integer number (15335160).

Almost surely, 2^81740258 is an apocalyptic number.

81740258 is a deficient number, since it is larger than the sum of its proper divisors (40941022).

81740258 is a wasteful number, since it uses less digits than its factorization.

81740258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23632.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 81740258 is about 9041.0319101306. The cubic root of 81740258 is about 433.9889461815.

The spelling of 81740258 in words is "eighty-one million, seven hundred forty thousand, two hundred fifty-eight".