81881074 has 16 divisors (see below), whose sum is σ = 137609856. Its totient is φ = 36212400.

The previous prime is 81881071. The next prime is 81881083. The reversal of 81881074 is 47018818.

It is a super-3 number, since 3×81881074³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (81881071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49482 + ... + 51109.

It is an arithmetic number, because the mean of its divisors is an integer number (8600616).

Almost surely, 2^81881074 is an apocalyptic number.

81881074 is a deficient number, since it is larger than the sum of its proper divisors (55728782).

81881074 is a wasteful number, since it uses less digits than its factorization.

81881074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100641.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 81881074 is about 9048.8161656650. The cubic root of 81881074 is about 434.2380177696.

The spelling of 81881074 in words is "eighty-one million, eight hundred eighty-one thousand, seventy-four".