664667094 has 128 divisors (see below), whose sum is σ = 1709309952. Its totient is φ = 167598720.

The previous prime is 664667089. The next prime is 664667099. The reversal of 664667094 is 490766466.

It is an interprime number because it is at equal distance from previous prime (664667089) and next prime (664667099).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664667099) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1810899 + ... + 1811265.

It is an arithmetic number, because the mean of its divisors is an integer number (13353984).

Almost surely, 2^664667094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664667094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (854654976).

664667094 is an abundant number, since it is smaller than the sum of its proper divisors (1044642858).

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

664667094 is a wasteful number, since it uses less digits than its factorization.

664667094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The square root of 664667094 is about 25781.1383379400. The cubic root of 664667094 is about 872.7061962614.

The spelling of 664667094 in words is "six hundred sixty-four million, six hundred sixty-seven thousand, ninety-four".