81433652 has 24 divisors (see below), whose sum is σ = 149893632. Its totient is φ = 38656800.

The previous prime is 81433637. The next prime is 81433679. The reversal of 81433652 is 25633418.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377 + ... + 12767.

It is an arithmetic number, because the mean of its divisors is an integer number (6245568).

Almost surely, 2^81433652 is an apocalyptic number.

It is an amenable number.

81433652 is a deficient number, since it is larger than the sum of its proper divisors (68459980).

81433652 is a wasteful number, since it uses less digits than its factorization.

81433652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12479 (or 12477 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 81433652 is about 9024.0596185974. The cubic root of 81433652 is about 433.4456384790.

The spelling of 81433652 in words is "eighty-one million, four hundred thirty-three thousand, six hundred fifty-two".