1280026553850 has 432 divisors, whose sum is σ = 3883922897400. Its totient is φ = 301830144000.

The previous prime is 1280026553831. The next prime is 1280026553881. The reversal of 1280026553850 is 583556200821.

1280026553850 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 0 + 2 + 65 + 538 + 50 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 13949263449 + 1266077290401 = 118107^2 + 1125201^2 .

It is a super-2 number, since 2×1280026553850² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1280026553796 and 1280026553805.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1002369412 + ... + 1002370688.

Almost surely, 2^{1280026553850} is an apocalyptic number.

1280026553850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280026553850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1941961448700).

1280026553850 is an abundant number, since it is smaller than the sum of its proper divisors (2603896343550).

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

1280026553850 is a wasteful number, since it uses less digits than its factorization.

1280026553850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807 (or 1788 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 1280026553850 in words is "one trillion, two hundred eighty billion, twenty-six million, five hundred fifty-three thousand, eight hundred fifty".