81889562 has 8 divisors (see below), whose sum is σ = 127070100. Its totient is φ = 39532864.

The previous prime is 81889559. The next prime is 81889567. The reversal of 81889562 is 26598818.

It can be written as a sum of positive squares in 2 ways, for example, as 73942801 + 7946761 = 8599^2 + 2819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81889567) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 705887 + ... + 706002.

Almost surely, 2^81889562 is an apocalyptic number.

81889562 is a deficient number, since it is larger than the sum of its proper divisors (45180538).

81889562 is a wasteful number, since it uses less digits than its factorization.

81889562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411920.

The product of its digits is 276480, while the sum is 47.

The square root of 81889562 is about 9049.2851651387. The cubic root of 81889562 is about 434.2530219896.

The spelling of 81889562 in words is "eighty-one million, eight hundred eighty-nine thousand, five hundred sixty-two".