81006028 has 6 divisors (see below), whose sum is σ = 141760556. Its totient is φ = 40503012.

The previous prime is 81006011. The next prime is 81006043. The reversal of 81006028 is 82060018.

It is a junction number, because it is equal to n+sod(n) for n = 81005993 and 81006011.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10125750 + ... + 10125757.

Almost surely, 2^81006028 is an apocalyptic number.

It is an amenable number.

81006028 is a deficient number, since it is larger than the sum of its proper divisors (60754528).

81006028 is a wasteful number, since it uses less digits than its factorization.

81006028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20251511 (or 20251509 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81006028 is about 9000.3348826585. The cubic root of 81006028 is about 432.6856040117.

The spelling of 81006028 in words is "eighty-one million, six thousand, twenty-eight".