81887450 has 24 divisors (see below), whose sum is σ = 154246080. Its totient is φ = 32338800.

The previous prime is 81887431. The next prime is 81887459. The reversal of 81887450 is 5478818.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81887398 and 81887407.

It is not an unprimeable number, because it can be changed into a prime (81887459) 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 11 ways as a sum of consecutive naturals, for example, 6416 + ... + 14315.

It is an arithmetic number, because the mean of its divisors is an integer number (6426920).

Almost surely, 2^81887450 is an apocalyptic number.

81887450 is a deficient number, since it is larger than the sum of its proper divisors (72358630).

81887450 is a wasteful number, since it uses less digits than its factorization.

81887450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20822 (or 20817 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 81887450 is about 9049.1684700861. The cubic root of 81887450 is about 434.2492887084.

The spelling of 81887450 in words is "eighty-one million, eight hundred eighty-seven thousand, four hundred fifty".