664029780 has 48 divisors (see below), whose sum is σ = 1940125824. Its totient is φ = 169375360.

The previous prime is 664029763. The next prime is 664029781. The reversal of 664029780 is 87920466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664029781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239211 + ... + 241970.

It is an arithmetic number, because the mean of its divisors is an integer number (40419288).

Almost surely, 2^664029780 is an apocalyptic number.

664029780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664029780 is an abundant number, since it is smaller than the sum of its proper divisors (1276096044).

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

664029780 is a wasteful number, since it uses less digits than its factorization.

664029780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481216 (or 481214 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 664029780 is about 25768.7752910378. The cubic root of 664029780 is about 872.4271765121.

The spelling of 664029780 in words is "six hundred sixty-four million, twenty-nine thousand, seven hundred eighty".