81820654 has 8 divisors (see below), whose sum is σ = 123188040. Its totient is φ = 40757976.

The previous prime is 81820649. The next prime is 81820667. The reversal of 81820654 is 45602818.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75504 + ... + 76579.

It is an arithmetic number, because the mean of its divisors is an integer number (15398505).

Almost surely, 2^81820654 is an apocalyptic number.

81820654 is a deficient number, since it is larger than the sum of its proper divisors (41367386).

81820654 is a wasteful number, since it uses less digits than its factorization.

81820654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152354.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 81820654 is about 9045.4769912924. The cubic root of 81820654 is about 434.1311834885.

The spelling of 81820654 in words is "eighty-one million, eight hundred twenty thousand, six hundred fifty-four".