620561645 has 16 divisors (see below), whose sum is σ = 814698432. Its totient is φ = 450024960.

The previous prime is 620561629. The next prime is 620561651. The reversal of 620561645 is 546165026.

It is not a de Polignac number, because 620561645 - 2⁴ = 620561629 is a prime.

It is a super-3 number, since 3×620561645³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

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, 3434 + ... + 35396.

It is an arithmetic number, because the mean of its divisors is an integer number (50918652).

Almost surely, 2^620561645 is an apocalyptic number.

It is an amenable number.

620561645 is a deficient number, since it is larger than the sum of its proper divisors (194136787).

620561645 is a wasteful number, since it uses less digits than its factorization.

620561645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32332.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 620561645 is about 24911.0747459840. The cubic root of 620561645 is about 852.9593022084.

It can be divided in two parts, 620 and 561645, that added together give a palindrome (562265).

The spelling of 620561645 in words is "six hundred twenty million, five hundred sixty-one thousand, six hundred forty-five".