81694052 has 48 divisors (see below), whose sum is σ = 162860544. Its totient is φ = 35520000.

The previous prime is 81694051. The next prime is 81694057. The reversal of 81694052 is 25049618.

It is not an unprimeable number, because it can be changed into a prime (81694051) 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, 137468 + ... + 138060.

It is an arithmetic number, because the mean of its divisors is an integer number (3392928).

Almost surely, 2^81694052 is an apocalyptic number.

It is an amenable number.

81694052 is a deficient number, since it is larger than the sum of its proper divisors (81166492).

81694052 is a wasteful number, since it uses less digits than its factorization.

81694052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 81694052 is about 9038.4761990061. The cubic root of 81694052 is about 433.9071559131.

It can be divided in two parts, 8169 and 4052, that added together give a palindrome (12221).

The spelling of 81694052 in words is "eighty-one million, six hundred ninety-four thousand, fifty-two".