81403258 has 16 divisors (see below), whose sum is σ = 130453920. Its totient is φ = 37982736.

The previous prime is 81403243. The next prime is 81403291. The reversal of 81403258 is 85230418.

It is a super-3 number, since 3×81403258³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13441 + ... + 18532.

It is an arithmetic number, because the mean of its divisors is an integer number (8153370).

Almost surely, 2^81403258 is an apocalyptic number.

81403258 is a deficient number, since it is larger than the sum of its proper divisors (49050662).

81403258 is a wasteful number, since it uses less digits than its factorization.

81403258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32061.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 81403258 is about 9022.3754078402. The cubic root of 81403258 is about 433.3917058775.

The spelling of 81403258 in words is "eighty-one million, four hundred three thousand, two hundred fifty-eight".