66427890 has 32 divisors (see below), whose sum is σ = 160275456. Its totient is φ = 17619840.

The previous prime is 66427877. The next prime is 66427901. The reversal of 66427890 is 9872466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67 + ... + 11526.

It is an arithmetic number, because the mean of its divisors is an integer number (5008608).

Almost surely, 2^66427890 is an apocalyptic number.

66427890 is an abundant number, since it is smaller than the sum of its proper divisors (93847566).

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

66427890 is a wasteful number, since it uses less digits than its factorization.

66427890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11794.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 66427890 is about 8150.3306681386. The cubic root of 66427890 is about 404.9954579585.

The spelling of 66427890 in words is "sixty-six million, four hundred twenty-seven thousand, eight hundred ninety".