81070656 has 28 divisors (see below), whose sum is σ = 214499952. Its totient is φ = 27023488.

The previous prime is 81070601. The next prime is 81070657. The reversal of 81070656 is 65607018.

It is not an unprimeable number, because it can be changed into a prime (81070657) 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, 210930 + ... + 211313.

Almost surely, 2^81070656 is an apocalyptic number.

It is an amenable number.

81070656 is an abundant number, since it is smaller than the sum of its proper divisors (133429296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81070656 is a wasteful number, since it uses less digits than its factorization.

81070656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422258 (or 422248 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 81070656 is about 9003.9244776930. The cubic root of 81070656 is about 432.8006414255.

The spelling of 81070656 in words is "eighty-one million, seventy thousand, six hundred fifty-six".