668219436 has 48 divisors (see below), whose sum is σ = 1823606400. Its totient is φ = 211016016.

The previous prime is 668219399. The next prime is 668219467. The reversal of 668219436 is 634912866.

It is a junction number, because it is equal to n+sod(n) for n = 668219391 and 668219400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160770 + ... + 164873.

It is an arithmetic number, because the mean of its divisors is an integer number (37991800).

Almost surely, 2^668219436 is an apocalyptic number.

It is an amenable number.

668219436 is an abundant number, since it is smaller than the sum of its proper divisors (1155386964).

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

668219436 is a wasteful number, since it uses less digits than its factorization.

668219436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325675 (or 325667 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 668219436 is about 25849.9407349417. The cubic root of 668219436 is about 874.2581733237.

The spelling of 668219436 in words is "six hundred sixty-eight million, two hundred nineteen thousand, four hundred thirty-six".