66536890 has 16 divisors (see below), whose sum is σ = 136876032. Its totient is φ = 22812624.

The previous prime is 66536863. The next prime is 66536893. The reversal of 66536890 is 9863566.

It is not an unprimeable number, because it can be changed into a prime (66536893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475194 + ... + 475333.

It is an arithmetic number, because the mean of its divisors is an integer number (8554752).

Almost surely, 2^66536890 is an apocalyptic number.

66536890 is an abundant number, since it is smaller than the sum of its proper divisors (70339142).

66536890 is a wasteful number, since it uses less digits than its factorization.

66536890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950541.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 66536890 is about 8157.0147725746. The cubic root of 66536890 is about 405.2168528258.

The spelling of 66536890 in words is "sixty-six million, five hundred thirty-six thousand, eight hundred ninety".