81428854 has 8 divisors (see below), whose sum is σ = 131538960. Its totient is φ = 37582536.

The previous prime is 81428849. The next prime is 81428869. The reversal of 81428854 is 45882418.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1565914 + ... + 1565965.

It is an arithmetic number, because the mean of its divisors is an integer number (16442370).

Almost surely, 2^81428854 is an apocalyptic number.

81428854 is a deficient number, since it is larger than the sum of its proper divisors (50110106).

81428854 is a wasteful number, since it uses less digits than its factorization.

81428854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131894.

The product of its digits is 81920, while the sum is 40.

The square root of 81428854 is about 9023.7937698066. The cubic root of 81428854 is about 433.4371255650.

The spelling of 81428854 in words is "eighty-one million, four hundred twenty-eight thousand, eight hundred fifty-four".