620745450 has 144 divisors (see below), whose sum is σ = 1705712256. Its totient is φ = 149260800.

The previous prime is 620745449. The next prime is 620745451. The reversal of 620745450 is 54547026.

It is an interprime number because it is at equal distance from previous prime (620745449) and next prime (620745451).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (620745451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1191190 + ... + 1191710.

It is an arithmetic number, because the mean of its divisors is an integer number (11845224).

Almost surely, 2^620745450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620745450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852856128).

620745450 is an abundant number, since it is smaller than the sum of its proper divisors (1084966806).

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

620745450 is a wasteful number, since it uses less digits than its factorization.

620745450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 620745450 is about 24914.7636954477. The cubic root of 620745450 is about 853.0435069550.

The spelling of 620745450 in words is "six hundred twenty million, seven hundred forty-five thousand, four hundred fifty".