620644545 has 16 divisors (see below), whose sum is σ = 1103368320. Its totient is φ = 331010352.

The previous prime is 620644523. The next prime is 620644553. The reversal of 620644545 is 545446026.

620644545 is a `hidden beast` number, since 6 + 2 + 0 + 644 + 5 + 4 + 5 = 666.

It is not a de Polignac number, because 620644545 - 2⁷ = 620644417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2298549 + ... + 2298818.

It is an arithmetic number, because the mean of its divisors is an integer number (68960520).

Almost surely, 2^620644545 is an apocalyptic number.

It is an amenable number.

620644545 is a deficient number, since it is larger than the sum of its proper divisors (482723775).

620644545 is a wasteful number, since it uses less digits than its factorization.

620644545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597381 (or 4597375 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 620644545 is about 24912.7386089928. The cubic root of 620644545 is about 852.9972824145.

The spelling of 620644545 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred forty-five".