81455658 has 8 divisors (see below), whose sum is σ = 162911328. Its totient is φ = 27151884.

The previous prime is 81455657. The next prime is 81455659. The reversal of 81455658 is 85655418.

It is an interprime number because it is at equal distance from previous prime (81455657) and next prime (81455659).

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

81455658 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81455651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6787966 + ... + 6787977.

It is an arithmetic number, because the mean of its divisors is an integer number (20363916).

Almost surely, 2^81455658 is an apocalyptic number.

81455658 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.

81455658 is a wasteful number, since it uses less digits than its factorization.

81455658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13575948.

The product of its digits is 192000, while the sum is 42.

The square root of 81455658 is about 9025.2788322578. The cubic root of 81455658 is about 433.4846786277.

The spelling of 81455658 in words is "eighty-one million, four hundred fifty-five thousand, six hundred fifty-eight".