1285366780 has 24 divisors (see below), whose sum is σ = 2714357520. Its totient is φ = 511272960.

The previous prime is 1285366757. The next prime is 1285366781. The reversal of 1285366780 is 876635821.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1285366780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285366781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175941 + ... + 183100.

It is an arithmetic number, because the mean of its divisors is an integer number (113098230).

Almost surely, 2^1285366780 is an apocalyptic number.

1285366780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285366780 is an abundant number, since it is smaller than the sum of its proper divisors (1428990740).

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

1285366780 is a wasteful number, since it uses less digits than its factorization.

1285366780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359229 (or 359227 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 1285366780 is about 35852.0122168896. The cubic root of 1285366780 is about 1087.2823976475.

The spelling of 1285366780 in words is "one billion, two hundred eighty-five million, three hundred sixty-six thousand, seven hundred eighty".