81246236 has 6 divisors (see below), whose sum is σ = 142180920. Its totient is φ = 40623116.

The previous prime is 81246229. The next prime is 81246241. The reversal of 81246236 is 63264218.

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, 10155776 + ... + 10155783.

It is an arithmetic number, because the mean of its divisors is an integer number (23696820).

Almost surely, 2^81246236 is an apocalyptic number.

It is an amenable number.

81246236 is a deficient number, since it is larger than the sum of its proper divisors (60934684).

81246236 is a wasteful number, since it uses less digits than its factorization.

81246236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20311563 (or 20311561 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 81246236 is about 9013.6693970880. The cubic root of 81246236 is about 433.1128643128.

The spelling of 81246236 in words is "eighty-one million, two hundred forty-six thousand, two hundred thirty-six".