66340890 has 128 divisors (see below), whose sum is σ = 220631040. Its totient is φ = 13780800.

The previous prime is 66340877. The next prime is 66340891. The reversal of 66340890 is 9804366.

It is a super-2 number, since 2×66340890² = 8802227371984200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66340891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19195 + ... + 22385.

It is an arithmetic number, because the mean of its divisors is an integer number (1723680).

Almost surely, 2^66340890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66340890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110315520).

66340890 is an abundant number, since it is smaller than the sum of its proper divisors (154290150).

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

66340890 is a wasteful number, since it uses less digits than its factorization.

66340890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225 (or 3219 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 66340890 is about 8144.9917127030. The cubic root of 66340890 is about 404.8185744327.

The spelling of 66340890 in words is "sixty-six million, three hundred forty thousand, eight hundred ninety".