81742204 has 12 divisors (see below), whose sum is σ = 143434984. Its totient is φ = 40760784.

The previous prime is 81742201. The next prime is 81742223. The reversal of 81742204 is 40224718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81742201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25902 + ... + 28885.

Almost surely, 2^81742204 is an apocalyptic number.

It is an amenable number.

81742204 is a deficient number, since it is larger than the sum of its proper divisors (61692780).

81742204 is a wasteful number, since it uses less digits than its factorization.

81742204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55164 (or 55162 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 81742204 is about 9041.1395299486. The cubic root of 81742204 is about 433.9923901630.

The spelling of 81742204 in words is "eighty-one million, seven hundred forty-two thousand, two hundred four".