81298116 has 36 divisors (see below), whose sum is σ = 208878124. Its totient is φ = 26654400.

The previous prime is 81298111. The next prime is 81298117. The reversal of 81298116 is 61189218.

It can be written as a sum of positive squares in 2 ways, for example, as 4665600 + 76632516 = 2160^2 + 8754^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81298111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16315 + ... + 20706.

Almost surely, 2^81298116 is an apocalyptic number.

It is an amenable number.

81298116 is an abundant number, since it is smaller than the sum of its proper divisors (127580008).

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

81298116 is a wasteful number, since it uses less digits than its factorization.

81298116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37092 (or 37087 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 81298116 is about 9016.5467890984. The cubic root of 81298116 is about 433.2050331544.

It can be divided in two parts, 81 and 298116, that multiplied together give a square (24147396 = 4914²).

The spelling of 81298116 in words is "eighty-one million, two hundred ninety-eight thousand, one hundred sixteen".