81359270 has 8 divisors (see below), whose sum is σ = 146446704. Its totient is φ = 32543704.

The previous prime is 81359251. The next prime is 81359281. The reversal of 81359270 is 7295318.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81359270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4067954 + ... + 4067973.

It is an arithmetic number, because the mean of its divisors is an integer number (18305838).

Almost surely, 2^81359270 is an apocalyptic number.

81359270 is a deficient number, since it is larger than the sum of its proper divisors (65087434).

81359270 is a wasteful number, since it uses less digits than its factorization.

81359270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8135934.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 81359270 is about 9019.9373612016. The cubic root of 81359270 is about 433.3136276378.

The spelling of 81359270 in words is "eighty-one million, three hundred fifty-nine thousand, two hundred seventy".