3720856513 has 16 divisors (see below), whose sum is σ = 4204704960. Its totient is φ = 3261585600.

The previous prime is 3720856481. The next prime is 3720856523. The reversal of 3720856513 is 3156580273.

It is a cyclic number.

It is not a de Polignac number, because 3720856513 - 2⁵ = 3720856481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3720856523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243643 + ... + 258463.

It is an arithmetic number, because the mean of its divisors is an integer number (262794060).

Almost surely, 2^3720856513 is an apocalyptic number.

It is an amenable number.

3720856513 is a deficient number, since it is larger than the sum of its proper divisors (483848447).

3720856513 is a wasteful number, since it uses less digits than its factorization.

3720856513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15648.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 3720856513 is about 60998.8238657107. The cubic root of 3720856513 is about 1549.5810887354.

The spelling of 3720856513 in words is "three billion, seven hundred twenty million, eight hundred fifty-six thousand, five hundred thirteen".