81884074 has 4 divisors (see below), whose sum is σ = 122826114. Its totient is φ = 40942036.

The previous prime is 81884063. The next prime is 81884119. The reversal of 81884074 is 47048818.

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., 80874049 + 1010025 = 8993^2 + 1005^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20471017 + ... + 20471020.

Almost surely, 2^81884074 is an apocalyptic number.

81884074 is a deficient number, since it is larger than the sum of its proper divisors (40942040).

81884074 is a wasteful number, since it uses less digits than its factorization.

81884074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40942039.

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 81884074 is about 9048.9819316871. The cubic root of 81884074 is about 434.2433209818.

The spelling of 81884074 in words is "eighty-one million, eight hundred eighty-four thousand, seventy-four".