81002810 has 16 divisors (see below), whose sum is σ = 166634496. Its totient is φ = 27772368.

The previous prime is 81002797. The next prime is 81002813. The reversal of 81002810 is 1820018.

It is a super-2 number, since 2×81002810² = 13122910455792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81002813) 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, 578522 + ... + 578661.

It is an arithmetic number, because the mean of its divisors is an integer number (10414656).

Almost surely, 2^81002810 is an apocalyptic number.

81002810 is an abundant number, since it is smaller than the sum of its proper divisors (85631686).

81002810 is a wasteful number, since it uses less digits than its factorization.

81002810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157197.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 81002810 is about 9000.1561097572. The cubic root of 81002810 is about 432.6798743940.

Adding to 81002810 its reverse (1820018), we get a palindrome (82822828).

The spelling of 81002810 in words is "eighty-one million, two thousand, eight hundred ten".