664603740 has 36 divisors (see below), whose sum is σ = 2015965224. Its totient is φ = 177227616.

The previous prime is 664603739. The next prime is 664603769. The reversal of 664603740 is 47306466.

664603740 is a `hidden beast` number, since 6 + 6 + 4 + 603 + 7 + 40 = 666.

664603740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 664603695 and 664603704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1845942 + ... + 1846301.

It is an arithmetic number, because the mean of its divisors is an integer number (55999034).

Almost surely, 2^664603740 is an apocalyptic number.

664603740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664603740 is an abundant number, since it is smaller than the sum of its proper divisors (1351361484).

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

664603740 is a wasteful number, since it uses less digits than its factorization.

664603740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692258 (or 3692253 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 664603740 is about 25779.9096197019. The cubic root of 664603740 is about 872.6784675004.

The spelling of 664603740 in words is "six hundred sixty-four million, six hundred three thousand, seven hundred forty".