664607419 has 16 divisors (see below), whose sum is σ = 785115136. Its totient is φ = 551114280.

The previous prime is 664607407. The next prime is 664607423. The reversal of 664607419 is 914706466.

It is not a de Polignac number, because 664607419 - 2⁹ = 664606907 is a prime.

It is a super-2 number, since 2×664607419² = 883406042779683122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664607429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206944 + ... + 210130.

It is an arithmetic number, because the mean of its divisors is an integer number (49069696).

Almost surely, 2^664607419 is an apocalyptic number.

664607419 is a deficient number, since it is larger than the sum of its proper divisors (120507717).

664607419 is an frugal number, since it uses more digits than its factorization.

664607419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3225 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 664607419 is about 25779.9809736159. The cubic root of 664607419 is about 872.6800777723.

The spelling of 664607419 in words is "six hundred sixty-four million, six hundred seven thousand, four hundred nineteen".