81932658 has 8 divisors (see below), whose sum is σ = 163865328. Its totient is φ = 27310884.

The previous prime is 81932633. The next prime is 81932663. The reversal of 81932658 is 85623918.

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

81932658 is an admirable 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, 6827716 + ... + 6827727.

It is an arithmetic number, because the mean of its divisors is an integer number (20483166).

Almost surely, 2^81932658 is an apocalyptic number.

81932658 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81932658 is a wasteful number, since it uses less digits than its factorization.

81932658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13655448.

The product of its digits is 103680, while the sum is 42.

The square root of 81932658 is about 9051.6660344933. Note that the first 3 decimals coincide. The cubic root of 81932658 is about 434.3291867077.

The spelling of 81932658 in words is "eighty-one million, nine hundred thirty-two thousand, six hundred fifty-eight".