81036810 has 24 divisors (see below), whose sum is σ = 210695940. Its totient is φ = 21609792.

The previous prime is 81036793. The next prime is 81036827. The reversal of 81036810 is 1863018.

It is an interprime number because it is at equal distance from previous prime (81036793) and next prime (81036827).

It can be written as a sum of positive squares in 2 ways, for example, as 75742209 + 5294601 = 8703^2 + 2301^2 .

It is a super-2 number, since 2×81036810² = 13133929149952200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 450115 + ... + 450294.

Almost surely, 2^81036810 is an apocalyptic number.

81036810 is an abundant number, since it is smaller than the sum of its proper divisors (129659130).

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

81036810 is a wasteful number, since it uses less digits than its factorization.

81036810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900422 (or 900419 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81036810 is about 9002.0447677181. The cubic root of 81036810 is about 432.7404033968.

Adding to 81036810 its reverse (1863018), we get a palindrome (82899828).

The spelling of 81036810 in words is "eighty-one million, thirty-six thousand, eight hundred ten".