81948844 has 6 divisors (see below), whose sum is σ = 143410484. Its totient is φ = 40974420.

The previous prime is 81948781. The next prime is 81948859. The reversal of 81948844 is 44884918.

It is a super-2 number, since 2×81948844² = 13431226065872672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81948794 and 81948803.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10243602 + ... + 10243609.

Almost surely, 2^81948844 is an apocalyptic number.

It is an amenable number.

81948844 is a deficient number, since it is larger than the sum of its proper divisors (61461640).

81948844 is a wasteful number, since it uses less digits than its factorization.

81948844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20487215 (or 20487213 counting only the distinct ones).

The product of its digits is 294912, while the sum is 46.

The square root of 81948844 is about 9052.5600798890. The cubic root of 81948844 is about 434.3577857609.

The spelling of 81948844 in words is "eighty-one million, nine hundred forty-eight thousand, eight hundred forty-four".