620911440 has 160 divisors (see below), whose sum is σ = 2148791040. Its totient is φ = 164795904.

The previous prime is 620911439. The next prime is 620911517. The reversal of 620911440 is 44119026.

620911440 is a `hidden beast` number, since 6 + 209 + 11 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567534 + ... + 568626.

It is an arithmetic number, because the mean of its divisors is an integer number (13429944).

Almost surely, 2^620911440 is an apocalyptic number.

620911440 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 620911440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074395520).

620911440 is an abundant number, since it is smaller than the sum of its proper divisors (1527879600).

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

620911440 is a wasteful number, since it uses less digits than its factorization.

620911440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 620911440 is about 24918.0946302080. The cubic root of 620911440 is about 853.1195360114.

The spelling of 620911440 in words is "six hundred twenty million, nine hundred eleven thousand, four hundred forty".