81774196 has 12 divisors (see below), whose sum is σ = 163548448. Its totient is φ = 35046072.

The previous prime is 81774163. The next prime is 81774197. The reversal of 81774196 is 69147718.

81774196 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81774197) 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, 1460226 + ... + 1460281.

Almost surely, 2^81774196 is an apocalyptic number.

It is an amenable number.

81774196 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81774196 is a wasteful number, since it uses less digits than its factorization.

81774196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920518 (or 2920516 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 81774196 is about 9042.9086028777. The cubic root of 81774196 is about 434.0490009586.

The spelling of 81774196 in words is "eighty-one million, seven hundred seventy-four thousand, one hundred ninety-six".