81236270 has 8 divisors (see below), whose sum is σ = 146225304. Its totient is φ = 32494504.

The previous prime is 81236249. The next prime is 81236273. The reversal of 81236270 is 7263218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81236273) 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, 4061804 + ... + 4061823.

It is an arithmetic number, because the mean of its divisors is an integer number (18278163).

Almost surely, 2^81236270 is an apocalyptic number.

81236270 is a deficient number, since it is larger than the sum of its proper divisors (64989034).

81236270 is a wasteful number, since it uses less digits than its factorization.

81236270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123634.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 81236270 is about 9013.1165531130. The cubic root of 81236270 is about 433.0951544491.

Adding to 81236270 its reverse (7263218), we get a palindrome (88499488).

The spelling of 81236270 in words is "eighty-one million, two hundred thirty-six thousand, two hundred seventy".