620243406 has 56 divisors (see below), whose sum is σ = 1403543160. Its totient is φ = 205469136.

The previous prime is 620243389. The next prime is 620243411. The reversal of 620243406 is 604342026.

620243406 is a `hidden beast` number, since 620 + 2 + 4 + 34 + 0 + 6 = 666.

620243406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 620243406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 251005 + ... + 253463.

Almost surely, 2^620243406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620243406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701771580).

620243406 is an abundant number, since it is smaller than the sum of its proper divisors (783299754).

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

620243406 is a wasteful number, since it uses less digits than its factorization.

620243406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652 (or 2637 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 620243406 is about 24904.6864264540. The cubic root of 620243406 is about 852.8134712331.

The spelling of 620243406 in words is "six hundred twenty million, two hundred forty-three thousand, four hundred six".