81368148 has 12 divisors (see below), whose sum is σ = 189859040. Its totient is φ = 27122712.

The previous prime is 81368129. The next prime is 81368167. The reversal of 81368148 is 84186318.

It is an interprime number because it is at equal distance from previous prime (81368129) and next prime (81368167).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×81368148³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3390328 + ... + 3390351.

Almost surely, 2^81368148 is an apocalyptic number.

It is an amenable number.

81368148 is an abundant number, since it is smaller than the sum of its proper divisors (108490892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81368148 is a wasteful number, since it uses less digits than its factorization.

81368148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780686 (or 6780684 counting only the distinct ones).

The product of its digits is 36864, while the sum is 39.

The square root of 81368148 is about 9020.4294797975. The cubic root of 81368148 is about 433.3293882613.

The spelling of 81368148 in words is "eighty-one million, three hundred sixty-eight thousand, one hundred forty-eight".