7861055787 has 72 divisors (see below), whose sum is σ = 12590429280. Its totient is φ = 4722831360.

The previous prime is 7861055773. The next prime is 7861055831. The reversal of 7861055787 is 7875501687.

It is a happy number.

7861055787 is a `hidden beast` number, since 7 + 8 + 6 + 1 + 0 + 557 + 87 = 666.

It is not a de Polignac number, because 7861055787 - 2⁷ = 7861055659 is a prime.

It is a super-3 number, since 3×7861055787³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (7861055737) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 17906514 + ... + 17906952.

Almost surely, 2^7861055787 is an apocalyptic number.

7861055787 is a deficient number, since it is larger than the sum of its proper divisors (4729373493).

7861055787 is a wasteful number, since it uses less digits than its factorization.

7861055787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 3292800, while the sum is 54.

The square root of 7861055787 is about 88662.5951966217. The cubic root of 7861055787 is about 1988.3536282366.

The spelling of 7861055787 in words is "seven billion, eight hundred sixty-one million, fifty-five thousand, seven hundred eighty-seven".