81862308 has 54 divisors (see below), whose sum is σ = 227463782. Its totient is φ = 24805440.

The previous prime is 81862283. The next prime is 81862321. The reversal of 81862308 is 80326818.

It can be written as a sum of positive squares in only one way, i.e., 75898944 + 5963364 = 8712^2 + 2442^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5041 + ... + 13752.

Almost surely, 2^81862308 is an apocalyptic number.

It is an amenable number.

81862308 is an abundant number, since it is smaller than the sum of its proper divisors (145601474).

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

81862308 is a wasteful number, since it uses less digits than its factorization.

81862308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18825 (or 18809 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81862308 is about 9047.7791750241. The cubic root of 81862308 is about 434.2048414694.

The spelling of 81862308 in words is "eighty-one million, eight hundred sixty-two thousand, three hundred eight".