1228157872836 has 24 divisors (see below), whose sum is σ = 3016528109280. Its totient is φ = 387839328192.

The previous prime is 1228157872819. The next prime is 1228157872841. The reversal of 1228157872836 is 6382787518221.

It is a self number, because there is not a number n which added to its sum of digits gives 1228157872836.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2693328441 + ... + 2693328896.

It is an arithmetic number, because the mean of its divisors is an integer number (125688671220).

Almost surely, 2^{1228157872836} is an apocalyptic number.

It is an amenable number.

1228157872836 is an abundant number, since it is smaller than the sum of its proper divisors (1788370236444).

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

1228157872836 is a wasteful number, since it uses less digits than its factorization.

1228157872836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5386657363 (or 5386657361 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 60.

The spelling of 1228157872836 in words is "one trillion, two hundred twenty-eight billion, one hundred fifty-seven million, eight hundred seventy-two thousand, eight hundred thirty-six".