81029058 has 16 divisors (see below), whose sum is σ = 176790816. Its totient is φ = 24554240.

The previous prime is 81029041. The next prime is 81029059. The reversal of 81029058 is 85092018.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81029059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613791 + ... + 613922.

It is an arithmetic number, because the mean of its divisors is an integer number (11049426).

Almost surely, 2^81029058 is an apocalyptic number.

81029058 is an abundant number, since it is smaller than the sum of its proper divisors (95761758).

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

81029058 is a wasteful number, since it uses less digits than its factorization.

81029058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227729.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 81029058 is about 9001.6141885775. The cubic root of 81029058 is about 432.7266042744.

The spelling of 81029058 in words is "eighty-one million, twenty-nine thousand, fifty-eight".