81846478 has 32 divisors (see below), whose sum is σ = 142871040. Its totient is φ = 34443360.

The previous prime is 81846451. The next prime is 81846481. The reversal of 81846478 is 87464818.

It is a happy number.

It is a super-2 number, since 2×81846478² = 13397691922008968, 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 in 15 ways as a sum of consecutive naturals, for example, 304128 + ... + 304396.

It is an arithmetic number, because the mean of its divisors is an integer number (4464720).

Almost surely, 2^81846478 is an apocalyptic number.

81846478 is a deficient number, since it is larger than the sum of its proper divisors (61024562).

81846478 is a wasteful number, since it uses less digits than its factorization.

81846478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592.

The product of its digits is 344064, while the sum is 46.

The square root of 81846478 is about 9046.9043324222. The cubic root of 81846478 is about 434.1768517637.

The spelling of 81846478 in words is "eighty-one million, eight hundred forty-six thousand, four hundred seventy-eight".