664602420 has 96 divisors (see below), whose sum is σ = 1975276800. Its totient is φ = 166385664.

The previous prime is 664602409. The next prime is 664602493. The reversal of 664602420 is 24206466.

664602420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 722721 + ... + 723639.

It is an arithmetic number, because the mean of its divisors is an integer number (20575800).

Almost surely, 2^664602420 is an apocalyptic number.

664602420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664602420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987638400).

664602420 is an abundant number, since it is smaller than the sum of its proper divisors (1310674380).

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

664602420 is a wasteful number, since it uses less digits than its factorization.

664602420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1655 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 664602420 is about 25779.8840183582. The cubic root of 664602420 is about 872.6778897444.

Adding to 664602420 its reverse (24206466), we get a palindrome (688808886).

The spelling of 664602420 in words is "six hundred sixty-four million, six hundred two thousand, four hundred twenty".