664371420 has 48 divisors (see below), whose sum is σ = 1864857120. Its totient is φ = 176726016.

The previous prime is 664371419. The next prime is 664371437. The reversal of 664371420 is 24173466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11004 + ... + 38076.

It is an arithmetic number, because the mean of its divisors is an integer number (38851190).

Almost surely, 2^664371420 is an apocalyptic number.

664371420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664371420 is an abundant number, since it is smaller than the sum of its proper divisors (1200485700).

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

664371420 is a wasteful number, since it uses less digits than its factorization.

664371420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27494 (or 27492 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 664371420 is about 25775.4033916057. The cubic root of 664371420 is about 872.5767706659.

The spelling of 664371420 in words is "six hundred sixty-four million, three hundred seventy-one thousand, four hundred twenty".