1277661047028 has 48 divisors (see below), whose sum is σ = 3003732486720. Its totient is φ = 422670970624.

The previous prime is 1277661047023. The next prime is 1277661047029. The reversal of 1277661047028 is 8207401667721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277661047023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6510550 + ... + 6703922.

It is an arithmetic number, because the mean of its divisors is an integer number (62577760140).

Almost surely, 2^{1277661047028} is an apocalyptic number.

It is an amenable number.

1277661047028 is an abundant number, since it is smaller than the sum of its proper divisors (1726071439692).

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

1277661047028 is a wasteful number, since it uses less digits than its factorization.

1277661047028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197536 (or 197534 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 1277661047028 in words is "one trillion, two hundred seventy-seven billion, six hundred sixty-one million, forty-seven thousand, twenty-eight".