81357230 has 16 divisors (see below), whose sum is σ = 146800080. Its totient is φ = 32463552.

The previous prime is 81357193. The next prime is 81357251. The reversal of 81357230 is 3275318.

It is a junction number, because it is equal to n+sod(n) for n = 81357193 and 81357202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5519 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (9175005).

Almost surely, 2^81357230 is an apocalyptic number.

81357230 is a deficient number, since it is larger than the sum of its proper divisors (65442850).

81357230 is a wasteful number, since it uses less digits than its factorization.

81357230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19843.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 81357230 is about 9019.8242776675. The cubic root of 81357230 is about 433.3100059763.

The spelling of 81357230 in words is "eighty-one million, three hundred fifty-seven thousand, two hundred thirty".