66469890 has 32 divisors (see below), whose sum is σ = 164676096. Its totient is φ = 17153280.

The previous prime is 66469861. The next prime is 66469901. The reversal of 66469890 is 9896466.

It is a super-2 number, since 2×66469890² = 8836492553224200, which contains 22 as substring.

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, 34807 + ... + 36666.

It is an arithmetic number, because the mean of its divisors is an integer number (5146128).

Almost surely, 2^66469890 is an apocalyptic number.

66469890 is an abundant number, since it is smaller than the sum of its proper divisors (98206206).

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

66469890 is a wasteful number, since it uses less digits than its factorization.

66469890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71514.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 66469890 is about 8152.9068435743. The cubic root of 66469890 is about 405.0807947329.

The spelling of 66469890 in words is "sixty-six million, four hundred sixty-nine thousand, eight hundred ninety".