4013620865 has 24 divisors (see below), whose sum is σ = 5331083688. Its totient is φ = 2890595840.

The previous prime is 4013620829. The next prime is 4013620867. The reversal of 4013620865 is 5680263104.

It can be written as a sum of positive squares in 4 ways, for example, as 643586161 + 3370034704 = 25369^2 + 58052^2 .

It is not a de Polignac number, because 4013620865 - 2⁶ = 4013620801 is a prime.

It is a super-2 number, since 2×4013620865² = 32218304895926696450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4013620867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 335 + ... + 89595.

It is an arithmetic number, because the mean of its divisors is an integer number (222128487).

Almost surely, 2^4013620865 is an apocalyptic number.

It is an amenable number.

4013620865 is a deficient number, since it is larger than the sum of its proper divisors (1317462823).

4013620865 is a wasteful number, since it uses less digits than its factorization.

4013620865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89329 (or 89306 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 4013620865 is about 63353.1440814108. The cubic root of 4013620865 is about 1589.2008252582.

Adding to 4013620865 its reverse (5680263104), we get a palindrome (9693883969).

The spelling of 4013620865 in words is "four billion, thirteen million, six hundred twenty thousand, eight hundred sixty-five".