664177240 has 16 divisors (see below), whose sum is σ = 1494398880. Its totient is φ = 265670880.

The previous prime is 664177229. The next prime is 664177247. The reversal of 664177240 is 42771466.

It is a super-2 number, since 2×664177240² = 882262812268035200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664177240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664177247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8302176 + ... + 8302255.

It is an arithmetic number, because the mean of its divisors is an integer number (93399930).

Almost surely, 2^664177240 is an apocalyptic number.

It is an amenable number.

664177240 is an abundant number, since it is smaller than the sum of its proper divisors (830221640).

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

664177240 is a wasteful number, since it uses less digits than its factorization.

664177240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16604442 (or 16604438 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 664177240 is about 25771.6363469610. The cubic root of 664177240 is about 872.4917512213.

The spelling of 664177240 in words is "six hundred sixty-four million, one hundred seventy-seven thousand, two hundred forty".