81894802 has 8 divisors (see below), whose sum is σ = 134009712. Its totient is φ = 37224900.

The previous prime is 81894793. The next prime is 81894803. The reversal of 81894802 is 20849818.

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 (81894803) 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 3 ways as a sum of consecutive naturals, for example, 1861224 + ... + 1861267.

It is an arithmetic number, because the mean of its divisors is an integer number (16751214).

Almost surely, 2^81894802 is an apocalyptic number.

81894802 is a deficient number, since it is larger than the sum of its proper divisors (52114910).

81894802 is a wasteful number, since it uses less digits than its factorization.

81894802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722504.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 81894802 is about 9049.5746861386. The cubic root of 81894802 is about 434.2622842091.

The spelling of 81894802 in words is "eighty-one million, eight hundred ninety-four thousand, eight hundred two".