81550035 has 48 divisors (see below), whose sum is σ = 165936576. Its totient is φ = 36267264.

The previous prime is 81550031. The next prime is 81550043. The reversal of 81550035 is 53005518.

81550035 is a `hidden beast` number, since 81 + 550 + 0 + 35 = 666.

It is not a de Polignac number, because 81550035 - 2² = 81550031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81549990 and 81550008.

It is not an unprimeable number, because it can be changed into a prime (81550031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8157 + ... + 15153.

It is an arithmetic number, because the mean of its divisors is an integer number (3457012).

Almost surely, 2^81550035 is an apocalyptic number.

81550035 is an abundant number, since it is smaller than the sum of its proper divisors (84386541).

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

81550035 is a wasteful number, since it uses less digits than its factorization.

81550035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7052 (or 7049 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 81550035 is about 9030.5057997877. The cubic root of 81550035 is about 433.6520301841.

The spelling of 81550035 in words is "eighty-one million, five hundred fifty thousand, thirty-five".