64990185 has 16 divisors (see below), whose sum is σ = 111983424. Its totient is φ = 31995072.

The previous prime is 64990183. The next prime is 64990187. The reversal of 64990185 is 58109946.

It is an interprime number because it is at equal distance from previous prime (64990183) and next prime (64990187).

It is not a de Polignac number, because 64990185 - 2¹ = 64990183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64990183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166447 + ... + 166836.

It is an arithmetic number, because the mean of its divisors is an integer number (6998964).

Almost surely, 2^64990185 is an apocalyptic number.

64990185 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64990185 is a deficient number, since it is larger than the sum of its proper divisors (46993239).

64990185 is a wasteful number, since it uses less digits than its factorization.

64990185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333304.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 64990185 is about 8061.6490248584. The cubic root of 64990185 is about 402.0523371872.

The spelling of 64990185 in words is "sixty-four million, nine hundred ninety thousand, one hundred eighty-five".