665623270 has 64 divisors (see below), whose sum is σ = 1371686400. Its totient is φ = 230381568.

The previous prime is 665623267. The next prime is 665623291. The reversal of 665623270 is 72326566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 770859 + ... + 771721.

It is an arithmetic number, because the mean of its divisors is an integer number (21432600).

Almost surely, 2^665623270 is an apocalyptic number.

665623270 is an abundant number, since it is smaller than the sum of its proper divisors (706063130).

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

665623270 is a wasteful number, since it uses less digits than its factorization.

665623270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 665623270 is about 25799.6757731565. The cubic root of 665623270 is about 873.1244812952.

The spelling of 665623270 in words is "six hundred sixty-five million, six hundred twenty-three thousand, two hundred seventy".