664083378 has 36 divisors (see below), whose sum is σ = 1673763390. Its totient is φ = 189737856.

The previous prime is 664083361. The next prime is 664083397. The reversal of 664083378 is 873380466.

It can be written as a sum of positive squares in only one way, i.e., 443649969 + 220433409 = 21063^2 + 14847^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 375583 + ... + 377346.

Almost surely, 2^664083378 is an apocalyptic number.

664083378 is an abundant number, since it is smaller than the sum of its proper divisors (1009680012).

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

664083378 is a wasteful number, since it uses less digits than its factorization.

664083378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752951 (or 752941 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 664083378 is about 25769.8152496288. The cubic root of 664083378 is about 872.4506489000.

The spelling of 664083378 in words is "six hundred sixty-four million, eighty-three thousand, three hundred seventy-eight".