81953848 has 8 divisors (see below), whose sum is σ = 153663480. Its totient is φ = 40976920.

The previous prime is 81953831. The next prime is 81953849. The reversal of 81953848 is 84835918.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81953798 and 81953807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81953849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5122108 + ... + 5122123.

It is an arithmetic number, because the mean of its divisors is an integer number (19207935).

Almost surely, 2^81953848 is an apocalyptic number.

It is an amenable number.

81953848 is a deficient number, since it is larger than the sum of its proper divisors (71709632).

81953848 is a wasteful number, since it uses less digits than its factorization.

81953848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10244237 (or 10244233 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The square root of 81953848 is about 9052.8364615738. The cubic root of 81953848 is about 434.3666265694.

The spelling of 81953848 in words is "eighty-one million, nine hundred fifty-three thousand, eight hundred forty-eight".