81006056 has 32 divisors (see below), whose sum is σ = 156643200. Its totient is φ = 39254400.

The previous prime is 81006053. The next prime is 81006059. The reversal of 81006056 is 65060018.

It is an interprime number because it is at equal distance from previous prime (81006053) and next prime (81006059).

It is a super-2 number, since 2×81006056² = 13123962217350272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81006053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33281 + ... + 35631.

It is an arithmetic number, because the mean of its divisors is an integer number (4895100).

Almost surely, 2^81006056 is an apocalyptic number.

It is an amenable number.

81006056 is a deficient number, since it is larger than the sum of its proper divisors (75637144).

81006056 is a wasteful number, since it uses less digits than its factorization.

81006056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489 (or 2485 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 81006056 is about 9000.3364381561. The cubic root of 81006056 is about 432.6856538647.

The spelling of 81006056 in words is "eighty-one million, six thousand, fifty-six".