620640545 has 8 divisors (see below), whose sum is σ = 851164224. Its totient is φ = 425582064.

The previous prime is 620640523. The next prime is 620640563. The reversal of 620640545 is 545046026.

620640545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620640545 - 2⁶ = 620640481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8866259 + ... + 8866328.

It is an arithmetic number, because the mean of its divisors is an integer number (106395528).

Almost surely, 2^620640545 is an apocalyptic number.

It is an amenable number.

620640545 is a deficient number, since it is larger than the sum of its proper divisors (230523679).

620640545 is a wasteful number, since it uses less digits than its factorization.

620640545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17732599.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 620640545 is about 24912.6583286489. The cubic root of 620640545 is about 852.9954499129.

The spelling of 620640545 in words is "six hundred twenty million, six hundred forty thousand, five hundred forty-five".