81880134 has 16 divisors (see below), whose sum is σ = 187154688. Its totient is φ = 23394312.

The previous prime is 81880121. The next prime is 81880147. The reversal of 81880134 is 43108818.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81880121) and next prime (81880147).

It is a junction number, because it is equal to n+sod(n) for n = 81880095 and 81880104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974722 + ... + 974805.

It is an arithmetic number, because the mean of its divisors is an integer number (11697168).

Almost surely, 2^81880134 is an apocalyptic number.

81880134 is an abundant number, since it is smaller than the sum of its proper divisors (105274554).

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

81880134 is a wasteful number, since it uses less digits than its factorization.

81880134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949539.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81880134 is about 9048.7642250199. The cubic root of 81880134 is about 434.2363560697.

The spelling of 81880134 in words is "eighty-one million, eight hundred eighty thousand, one hundred thirty-four".