81862826 has 4 divisors (see below), whose sum is σ = 122794242. Its totient is φ = 40931412.

The previous prime is 81862813. The next prime is 81862831. The reversal of 81862826 is 62826818.

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

It can be written as a sum of positive squares in only one way, i.e., 54037201 + 27825625 = 7351^2 + 5275^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20465705 + ... + 20465708.

Almost surely, 2^81862826 is an apocalyptic number.

81862826 is a deficient number, since it is larger than the sum of its proper divisors (40931416).

81862826 is a wasteful number, since it uses less digits than its factorization.

81862826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40931415.

The product of its digits is 73728, while the sum is 41.

The square root of 81862826 is about 9047.8078007880. The cubic root of 81862826 is about 434.2057573066.

The spelling of 81862826 in words is "eighty-one million, eight hundred sixty-two thousand, eight hundred twenty-six".