81452758 has 4 divisors (see below), whose sum is σ = 122179140. Its totient is φ = 40726378.

The previous prime is 81452741. The next prime is 81452801. The reversal of 81452758 is 85725418.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 81452758.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20363188 + ... + 20363191.

It is an arithmetic number, because the mean of its divisors is an integer number (30544785).

Almost surely, 2^81452758 is an apocalyptic number.

81452758 is a deficient number, since it is larger than the sum of its proper divisors (40726382).

81452758 is a wasteful number, since it uses less digits than its factorization.

81452758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40726381.

The product of its digits is 89600, while the sum is 40.

The square root of 81452758 is about 9025.1181709715. The cubic root of 81452758 is about 433.4795342317.

The spelling of 81452758 in words is "eighty-one million, four hundred fifty-two thousand, seven hundred fifty-eight".