81994627 has 16 divisors (see below), whose sum is σ = 98939232. Its totient is φ = 66942720.

The previous prime is 81994589. The next prime is 81994639. The reversal of 81994627 is 72649918.

It is not a de Polignac number, because 81994627 - 2⁷ = 81994499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81994727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2458 + ... + 13039.

It is an arithmetic number, because the mean of its divisors is an integer number (6183702).

Almost surely, 2^81994627 is an apocalyptic number.

81994627 is a deficient number, since it is larger than the sum of its proper divisors (16944605).

81994627 is a wasteful number, since it uses less digits than its factorization.

81994627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15558.

The product of its digits is 217728, while the sum is 46.

The square root of 81994627 is about 9055.0884589826. The cubic root of 81994627 is about 434.4386593863.

It can be divided in two parts, 81994 and 627, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 81994627 in words is "eighty-one million, nine hundred ninety-four thousand, six hundred twenty-seven".