3621778085 has 4 divisors (see below), whose sum is σ = 4346133708. Its totient is φ = 2897422464.

The previous prime is 3621778067. The next prime is 3621778087. The reversal of 3621778085 is 5808771263.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5808771263 = 63853 ⋅90971.

It can be written as a sum of positive squares in 2 ways, for example, as 2538446689 + 1083331396 = 50383^2 + 32914^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621778085 - 2⁶ = 3621778021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621778087) 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, 362177804 + ... + 362177813.

It is an arithmetic number, because the mean of its divisors is an integer number (1086533427).

Almost surely, 2^3621778085 is an apocalyptic number.

It is an amenable number.

3621778085 is a deficient number, since it is larger than the sum of its proper divisors (724355623).

3621778085 is an equidigital number, since it uses as much as digits as its factorization.

3621778085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724355622.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 3621778085 is about 60181.2103982630. The cubic root of 3621778085 is about 1535.7031632891.

The spelling of 3621778085 in words is "three billion, six hundred twenty-one million, seven hundred seventy-eight thousand, eighty-five".