81883456 has 28 divisors (see below), whose sum is σ = 162850068. Its totient is φ = 40850432.

The previous prime is 81883453. The next prime is 81883489. The reversal of 81883456 is 65438818.

It can be written as a sum of positive squares in 2 ways, for example, as 20793600 + 61089856 = 4560^2 + 7816^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81883453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34500 + ... + 36796.

Almost surely, 2^81883456 is an apocalyptic number.

It is an amenable number.

81883456 is a deficient number, since it is larger than the sum of its proper divisors (80966612).

81883456 is a wasteful number, since it uses less digits than its factorization.

81883456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2856 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 81883456 is about 9048.9477841349. The cubic root of 81883456 is about 434.2422285307.

The spelling of 81883456 in words is "eighty-one million, eight hundred eighty-three thousand, four hundred fifty-six".