1200256205628 has 12 divisors (see below), whose sum is σ = 2800597813160. Its totient is φ = 400085401872.

The previous prime is 1200256205593. The next prime is 1200256205647. The reversal of 1200256205628 is 8265026520021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1200256205628² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50010675223 + ... + 50010675246.

Almost surely, 2^{1200256205628} is an apocalyptic number.

It is an amenable number.

1200256205628 is an abundant number, since it is smaller than the sum of its proper divisors (1600341607532).

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

1200256205628 is a wasteful number, since it uses less digits than its factorization.

1200256205628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100021350476 (or 100021350474 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 1200256205628 in words is "one trillion, two hundred billion, two hundred fifty-six million, two hundred five thousand, six hundred twenty-eight".