620557920 has 288 divisors, whose sum is σ = 2216253312. Its totient is φ = 157986816.

The previous prime is 620557913. The next prime is 620557939. The reversal of 620557920 is 29755026.

620557920 is a `hidden beast` number, since 62 + 0 + 5 + 579 + 20 = 666.

It is a Cunningham number, because it is equal to 24911²-1.

It is a tau number, because it is divible by the number of its divisors (288).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3586954 + ... + 3587126.

It is an arithmetic number, because the mean of its divisors is an integer number (7695324).

Almost surely, 2^620557920 is an apocalyptic number.

620557920 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 620557920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108126656).

620557920 is an abundant number, since it is smaller than the sum of its proper divisors (1595695392).

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

620557920 is a wasteful number, since it uses less digits than its factorization.

620557920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 620557920 is about 24910.9999799285. Note that the first 4 decimals coincide. The cubic root of 620557920 is about 852.9575955395.

The spelling of 620557920 in words is "six hundred twenty million, five hundred fifty-seven thousand, nine hundred twenty".