81652412 has 12 divisors (see below), whose sum is σ = 144613896. Its totient is φ = 40334160.

The previous prime is 81652409. The next prime is 81652421. The reversal of 81652412 is 21425618.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122639 + ... + 123302.

It is an arithmetic number, because the mean of its divisors is an integer number (12051158).

Almost surely, 2^81652412 is an apocalyptic number.

It is an amenable number.

81652412 is a deficient number, since it is larger than the sum of its proper divisors (62961484).

81652412 is a wasteful number, since it uses less digits than its factorization.

81652412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246028 (or 246026 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 81652412 is about 9036.1724197804. The cubic root of 81652412 is about 433.8334215993.

The spelling of 81652412 in words is "eighty-one million, six hundred fifty-two thousand, four hundred twelve".