1664406272 has 18 divisors (see below), whose sum is σ = 3322311468. Its totient is φ = 832203008.

The previous prime is 1664406217. The next prime is 1664406313. The reversal of 1664406272 is 2726044661.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3250538 + ... + 3251049.

Almost surely, 2^1664406272 is an apocalyptic number.

It is an amenable number.

1664406272 is a deficient number, since it is larger than the sum of its proper divisors (1657905196).

1664406272 is an frugal number, since it uses more digits than its factorization.

1664406272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501603 (or 6501589 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 1664406272 is about 40797.1355857246. The cubic root of 1664406272 is about 1185.0948601565.

The spelling of 1664406272 in words is "one billion, six hundred sixty-four million, four hundred six thousand, two hundred seventy-two".