81534704 has 10 divisors (see below), whose sum is σ = 157973520. Its totient is φ = 40767344.

The previous prime is 81534683. The next prime is 81534731. The reversal of 81534704 is 40743518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2547944 + ... + 2547975.

It is an arithmetic number, because the mean of its divisors is an integer number (15797352).

Almost surely, 2^81534704 is an apocalyptic number.

It is an amenable number.

81534704 is a deficient number, since it is larger than the sum of its proper divisors (76438816).

81534704 is a wasteful number, since it uses less digits than its factorization.

81534704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095927 (or 5095921 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 81534704 is about 9029.6569148556. The cubic root of 81534704 is about 433.6248536745.

The spelling of 81534704 in words is "eighty-one million, five hundred thirty-four thousand, seven hundred four".