81802262 has 4 divisors (see below), whose sum is σ = 122703396. Its totient is φ = 40901130.

The previous prime is 81802241. The next prime is 81802271. The reversal of 81802262 is 26220818.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×81802262² = 13383220136633288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20450564 + ... + 20450567.

It is an arithmetic number, because the mean of its divisors is an integer number (30675849).

Almost surely, 2^81802262 is an apocalyptic number.

81802262 is a deficient number, since it is larger than the sum of its proper divisors (40901134).

81802262 is a wasteful number, since it uses less digits than its factorization.

81802262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40901133.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 81802262 is about 9044.4602934614. The cubic root of 81802262 is about 434.0986524234.

The spelling of 81802262 in words is "eighty-one million, eight hundred two thousand, two hundred sixty-two".