12087777258 has 80 divisors (see below), whose sum is σ = 27456260040. Its totient is φ = 3974344704.

The previous prime is 12087777253. The next prime is 12087777311. The reversal of 12087777258 is 85277778021.

It can be written as a sum of positive squares in 4 ways, for example, as 11951518329 + 136258929 = 109323^2 + 11673^2 .

It is a super-2 number, since 2×12087777258² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12087777253) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8318460 + ... + 8319912.

Almost surely, 2^12087777258 is an apocalyptic number.

12087777258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12087777258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13728130020).

12087777258 is an abundant number, since it is smaller than the sum of its proper divisors (15368482782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12087777258 is a wasteful number, since it uses less digits than its factorization.

12087777258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133 (or 2124 counting only the distinct ones).

The product of its (nonzero) digits is 3073280, while the sum is 54.

It can be divided in two parts, 120877 and 77258, that added together give a triangular number (198135 = T₆₂₉).

The spelling of 12087777258 in words is "twelve billion, eighty-seven million, seven hundred seventy-seven thousand, two hundred fifty-eight".