81616148 has 12 divisors (see below), whose sum is σ = 144139380. Its totient is φ = 40433472.

The previous prime is 81616147. The next prime is 81616159. The reversal of 81616148 is 84161618.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47720464 + 33895684 = 6908^2 + 5822^2 .

It is a super-2 number, since 2×81616148² = 13322391228715808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81616147) 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, 93161 + ... + 94032.

It is an arithmetic number, because the mean of its divisors is an integer number (12011615).

Almost surely, 2^81616148 is an apocalyptic number.

It is an amenable number.

81616148 is a deficient number, since it is larger than the sum of its proper divisors (62523232).

81616148 is a wasteful number, since it uses less digits than its factorization.

81616148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187306 (or 187304 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 81616148 is about 9034.1655951172. The cubic root of 81616148 is about 433.7691864490.

The spelling of 81616148 in words is "eighty-one million, six hundred sixteen thousand, one hundred forty-eight".