665447740 has 24 divisors (see below), whose sum is σ = 1399647312. Its totient is φ = 265758720.

The previous prime is 665447737. The next prime is 665447759. The reversal of 665447740 is 47744566.

It is a super-2 number, since 2×665447740² = 885641389342215200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13134 + ... + 38773.

It is an arithmetic number, because the mean of its divisors is an integer number (58318638).

Almost surely, 2^665447740 is an apocalyptic number.

It is an amenable number.

665447740 is an abundant number, since it is smaller than the sum of its proper divisors (734199572).

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

665447740 is a wasteful number, since it uses less digits than its factorization.

665447740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52557 (or 52555 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 43.

The square root of 665447740 is about 25796.2737619215. The cubic root of 665447740 is about 873.0477246567.

The spelling of 665447740 in words is "six hundred sixty-five million, four hundred forty-seven thousand, seven hundred forty".