620345645 has 4 divisors (see below), whose sum is σ = 744414780. Its totient is φ = 496276512.

The previous prime is 620345639. The next prime is 620345651. The reversal of 620345645 is 546543026.

It is a happy number.

620345645 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (620345639) and next prime (620345651).

It can be written as a sum of positive squares in 2 ways, for example, as 374577316 + 245768329 = 19354^2 + 15677^2 .

It is a cyclic number.

It is not a de Polignac number, because 620345645 - 2⁴ = 620345629 is a prime.

It is a super-3 number, since 3×620345645³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 62034560 + ... + 62034569.

It is an arithmetic number, because the mean of its divisors is an integer number (186103695).

Almost surely, 2^620345645 is an apocalyptic number.

It is an amenable number.

620345645 is a deficient number, since it is larger than the sum of its proper divisors (124069135).

620345645 is a wasteful number, since it uses less digits than its factorization.

620345645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124069134.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 620345645 is about 24906.7389475218. The cubic root of 620345645 is about 852.8603270348.

The spelling of 620345645 in words is "six hundred twenty million, three hundred forty-five thousand, six hundred forty-five".