81263298 has 16 divisors (see below), whose sum is σ = 172087200. Its totient is φ = 25494336.

The previous prime is 81263297. The next prime is 81263309. The reversal of 81263298 is 89236218.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81263291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398248 + ... + 398451.

It is an arithmetic number, because the mean of its divisors is an integer number (10755450).

Almost surely, 2^81263298 is an apocalyptic number.

81263298 is an abundant number, since it is smaller than the sum of its proper divisors (90823902).

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

81263298 is a wasteful number, since it uses less digits than its factorization.

81263298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796721.

The product of its digits is 41472, while the sum is 39.

The square root of 81263298 is about 9014.6157988014. The cubic root of 81263298 is about 433.1431806073.

The spelling of 81263298 in words is "eighty-one million, two hundred sixty-three thousand, two hundred ninety-eight".