664970238 has 48 divisors (see below), whose sum is σ = 1485993600. Its totient is φ = 214806480.

The previous prime is 664970237. The next prime is 664970269. The reversal of 664970238 is 832079466.

It is a junction number, because it is equal to n+sod(n) for n = 664970193 and 664970202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664970231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70993 + ... + 79811.

It is an arithmetic number, because the mean of its divisors is an integer number (30958200).

Almost surely, 2^664970238 is an apocalyptic number.

664970238 is an abundant number, since it is smaller than the sum of its proper divisors (821023362).

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

664970238 is a wasteful number, since it uses less digits than its factorization.

664970238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8957 (or 8954 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 664970238 is about 25787.0168495699. The cubic root of 664970238 is about 872.8388518620.

The spelling of 664970238 in words is "six hundred sixty-four million, nine hundred seventy thousand, two hundred thirty-eight".