621145786 has 8 divisors (see below), whose sum is σ = 931855284. Its totient is φ = 310527360.

The previous prime is 621145781. The next prime is 621145799. The reversal of 621145786 is 687541126.

It can be written as a sum of positive squares in 2 ways, for example, as 620956561 + 189225 = 24919^2 + 435^2 .

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

It is not an unprimeable number, because it can be changed into a prime (621145781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885 + ... + 35296.

Almost surely, 2^621145786 is an apocalyptic number.

621145786 is a deficient number, since it is larger than the sum of its proper divisors (310709498).

621145786 is a wasteful number, since it uses less digits than its factorization.

621145786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45536.

The product of its digits is 80640, while the sum is 40.

The square root of 621145786 is about 24922.7965124301. The cubic root of 621145786 is about 853.2268513713.

The spelling of 621145786 in words is "six hundred twenty-one million, one hundred forty-five thousand, seven hundred eighty-six".