81056830 has 16 divisors (see below), whose sum is σ = 152246304. Its totient is φ = 31012960.

The previous prime is 81056819. The next prime is 81056851. The reversal of 81056830 is 3865018.

It is a junction number, because it is equal to n+sod(n) for n = 81056792 and 81056801.

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, 175981 + ... + 176440.

It is an arithmetic number, because the mean of its divisors is an integer number (9515394).

Almost surely, 2^81056830 is an apocalyptic number.

81056830 is a deficient number, since it is larger than the sum of its proper divisors (71189474).

81056830 is a wasteful number, since it uses less digits than its factorization.

81056830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352451.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81056830 is about 9003.1566686357. The cubic root of 81056830 is about 432.7760363786.

The spelling of 81056830 in words is "eighty-one million, fifty-six thousand, eight hundred thirty".