81974354 has 72 divisors (see below), whose sum is σ = 163021824. Its totient is φ = 30769200.

The previous prime is 81974353. The next prime is 81974363. The reversal of 81974354 is 45347918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81974353) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 367487 + ... + 367709.

It is an arithmetic number, because the mean of its divisors is an integer number (2264192).

Almost surely, 2^81974354 is an apocalyptic number.

81974354 is a deficient number, since it is larger than the sum of its proper divisors (81047470).

81974354 is a wasteful number, since it uses less digits than its factorization.

81974354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 274 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 81974354 is about 9053.9689639406. The cubic root of 81974354 is about 434.4028517517.

It can be divided in two parts, 81974 and 354, that added together give a palindrome (82328).

The spelling of 81974354 in words is "eighty-one million, nine hundred seventy-four thousand, three hundred fifty-four".