64490185 has 4 divisors (see below), whose sum is σ = 77388228. Its totient is φ = 51592144.

The previous prime is 64490143. The next prime is 64490189. The reversal of 64490185 is 58109446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10673289 + 53816896 = 3267^2 + 7336^2 .

It is a cyclic number.

It is not a de Polignac number, because 64490185 - 2⁷ = 64490057 is a prime.

It is a super-2 number, since 2×64490185² = 8317967922668450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64490189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6449014 + ... + 6449023.

It is an arithmetic number, because the mean of its divisors is an integer number (19347057).

Almost surely, 2^64490185 is an apocalyptic number.

It is an amenable number.

64490185 is a deficient number, since it is larger than the sum of its proper divisors (12898043).

64490185 is a wasteful number, since it uses less digits than its factorization.

64490185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12898042.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 64490185 is about 8030.5781236471. The cubic root of 64490185 is about 401.0186225683.

The spelling of 64490185 in words is "sixty-four million, four hundred ninety thousand, one hundred eighty-five".