620403660 has 36 divisors (see below), whose sum is σ = 1881891648. Its totient is φ = 165440928.

The previous prime is 620403601. The next prime is 620403673. The reversal of 620403660 is 66304026.

620403660 is a `hidden beast` number, since 620 + 4 + 0 + 36 + 6 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1723164 + ... + 1723523.

It is an arithmetic number, because the mean of its divisors is an integer number (52274768).

Almost surely, 2^620403660 is an apocalyptic number.

620403660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

620403660 is an abundant number, since it is smaller than the sum of its proper divisors (1261487988).

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

620403660 is a wasteful number, since it uses less digits than its factorization.

620403660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3446702 (or 3446697 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 620403660 is about 24907.9035649330. The cubic root of 620403660 is about 852.8869128315.

Adding to 620403660 its reverse (66304026), we get a palindrome (686707686).

The spelling of 620403660 in words is "six hundred twenty million, four hundred three thousand, six hundred sixty".