664426212 has 24 divisors (see below), whose sum is σ = 1556367456. Its totient is φ = 220612608.

The previous prime is 664426211. The next prime is 664426241. The reversal of 664426212 is 212624466.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (664426211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104638 + ... + 110805.

It is an arithmetic number, because the mean of its divisors is an integer number (64848644).

Almost surely, 2^664426212 is an apocalyptic number.

It is an amenable number.

664426212 is an abundant number, since it is smaller than the sum of its proper divisors (891941244).

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

664426212 is a wasteful number, since it uses less digits than its factorization.

664426212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215707 (or 215705 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 664426212 is about 25776.4662434555. The cubic root of 664426212 is about 872.6007577062.

The spelling of 664426212 in words is "six hundred sixty-four million, four hundred twenty-six thousand, two hundred twelve".