81974410 has 32 divisors (see below), whose sum is σ = 169729920. Its totient is φ = 27922752.

The previous prime is 81974363. The next prime is 81974437. The reversal of 81974410 is 1447918.

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, 7261 + ... + 14719.

It is an arithmetic number, because the mean of its divisors is an integer number (5304060).

Almost surely, 2^81974410 is an apocalyptic number.

81974410 is an abundant number, since it is smaller than the sum of its proper divisors (87755510).

81974410 is a wasteful number, since it uses less digits than its factorization.

81974410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7630.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81974410 is about 9053.9720565065. The cubic root of 81974410 is about 434.4029506711.

The spelling of 81974410 in words is "eighty-one million, nine hundred seventy-four thousand, four hundred ten".