621413785 has 4 divisors (see below), whose sum is σ = 745696548. Its totient is φ = 497131024.

The previous prime is 621413777. The next prime is 621413789. The reversal of 621413785 is 587314126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 183223296 + 438190489 = 13536^2 + 20933^2 .

It is a cyclic number.

It is not a de Polignac number, because 621413785 - 2³ = 621413777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621413789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62141374 + ... + 62141383.

It is an arithmetic number, because the mean of its divisors is an integer number (186424137).

Almost surely, 2^621413785 is an apocalyptic number.

It is an amenable number.

621413785 is a deficient number, since it is larger than the sum of its proper divisors (124282763).

621413785 is a wasteful number, since it uses less digits than its factorization.

621413785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124282762.

The product of its digits is 40320, while the sum is 37.

The square root of 621413785 is about 24928.1725162516. The cubic root of 621413785 is about 853.3495445563.

The spelling of 621413785 in words is "six hundred twenty-one million, four hundred thirteen thousand, seven hundred eighty-five".