621120745 has 16 divisors (see below), whose sum is σ = 869948928. Its totient is φ = 416848320.

The previous prime is 621120733. The next prime is 621120749. The reversal of 621120745 is 547021126.

It is not a de Polignac number, because 621120745 - 2⁵ = 621120713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621120749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187146 + ... + 190435.

It is an arithmetic number, because the mean of its divisors is an integer number (54371808).

Almost surely, 2^621120745 is an apocalyptic number.

It is an amenable number.

621120745 is a deficient number, since it is larger than the sum of its proper divisors (248828183).

621120745 is a wasteful number, since it uses less digits than its factorization.

621120745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377640.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 621120745 is about 24922.2941359739. The cubic root of 621120745 is about 853.2153854958.

The spelling of 621120745 in words is "six hundred twenty-one million, one hundred twenty thousand, seven hundred forty-five".