81658948 has 12 divisors (see below), whose sum is σ = 163317952. Its totient is φ = 34996680.

The previous prime is 81658909. The next prime is 81658949. The reversal of 81658948 is 84985618.

81658948 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81658949) 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, 1458168 + ... + 1458223.

Almost surely, 2^81658948 is an apocalyptic number.

It is an amenable number.

81658948 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.

81658948 is a wasteful number, since it uses less digits than its factorization.

81658948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916402 (or 2916400 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 81658948 is about 9036.5340700957. The cubic root of 81658948 is about 433.8449969241.

The spelling of 81658948 in words is "eighty-one million, six hundred fifty-eight thousand, nine hundred forty-eight".