620001144 has 96 divisors (see below), whose sum is σ = 1931080320. Its totient is φ = 176033088.

The previous prime is 620001127. The next prime is 620001149. The reversal of 620001144 is 441100026.

620001144 is a `hidden beast` number, since 620 + 0 + 0 + 1 + 1 + 44 = 666.

It is a super-2 number, since 2×620001144² = 768802837122617472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620001149) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 78379 + ... + 85925.

It is an arithmetic number, because the mean of its divisors is an integer number (20115420).

Almost surely, 2^620001144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620001144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965540160).

620001144 is an abundant number, since it is smaller than the sum of its proper divisors (1311079176).

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

620001144 is a wasteful number, since it uses less digits than its factorization.

620001144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7729 (or 7722 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 620001144 is about 24899.8221680397. The cubic root of 620001144 is about 852.7024227853.

The spelling of 620001144 in words is "six hundred twenty million, one thousand, one hundred forty-four".