1355645780 has 18 divisors (see below), whose sum is σ = 2847201966. Its totient is φ = 542192448.

The previous prime is 1355645743. The next prime is 1355645831. The reversal of 1355645780 is 875465531.

1355645780 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 80656 + 1355565124 = 284^2 + 36818^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160544 + ... + 168776.

It is an arithmetic number, because the mean of its divisors is an integer number (158177887).

Almost surely, 2^1355645780 is an apocalyptic number.

1355645780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1355645780 is an abundant number, since it is smaller than the sum of its proper divisors (1491556186).

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

1355645780 is an frugal number, since it uses more digits than its factorization.

1355645780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16475 (or 8240 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 44.

The square root of 1355645780 is about 36819.0953175115. The cubic root of 1355645780 is about 1106.7479906286.

The spelling of 1355645780 in words is "one billion, three hundred fifty-five million, six hundred forty-five thousand, seven hundred eighty".