81948735 has 24 divisors (see below), whose sum is σ = 154958544. Its totient is φ = 39732480.

The previous prime is 81948733. The next prime is 81948749. The reversal of 81948735 is 53784918.

It is not a de Polignac number, because 81948735 - 2¹ = 81948733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81948731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82282 + ... + 83271.

It is an arithmetic number, because the mean of its divisors is an integer number (6456606).

Almost surely, 2^81948735 is an apocalyptic number.

81948735 is a deficient number, since it is larger than the sum of its proper divisors (73009809).

81948735 is a wasteful number, since it uses less digits than its factorization.

81948735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165575 (or 165572 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 81948735 is about 9052.5540594906. The cubic root of 81948735 is about 434.3575931813.

The spelling of 81948735 in words is "eighty-one million, nine hundred forty-eight thousand, seven hundred thirty-five".