3870787581 has 12 divisors (see below), whose sum is σ = 5798217152. Its totient is φ = 2580524892.

The previous prime is 3870787561. The next prime is 3870787589. The reversal of 3870787581 is 1857870783.

It is not a de Polignac number, because 3870787581 - 2⁶ = 3870787517 is a prime.

It is a super-2 number, since 2×3870787581² = 29965992994447663122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3870787589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7964341 + ... + 7964826.

Almost surely, 2^3870787581 is an apocalyptic number.

It is an amenable number.

3870787581 is a deficient number, since it is larger than the sum of its proper divisors (1927429571).

3870787581 is an equidigital number, since it uses as much as digits as its factorization.

3870787581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15929182 (or 15929170 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 54.

The square root of 3870787581 is about 62215.6538260268. The cubic root of 3870787581 is about 1570.1209666487.

The spelling of 3870787581 in words is "three billion, eight hundred seventy million, seven hundred eighty-seven thousand, five hundred eighty-one".