1355079780 has 84 divisors (see below), whose sum is σ = 4266595452. Its totient is φ = 361350720.

The previous prime is 1355079743. The next prime is 1355079833. The reversal of 1355079780 is 879705531.

1355079780 is a `hidden beast` number, since 1 + 3 + 550 + 7 + 97 + 8 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 156950784 + 1198128996 = 12528^2 + 34614^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 31891 + ... + 61050.

It is an arithmetic number, because the mean of its divisors is an integer number (50792803).

Almost surely, 2^1355079780 is an apocalyptic number.

1355079780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1355079780 is an abundant number, since it is smaller than the sum of its proper divisors (2911515672).

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

1355079780 is an equidigital number, since it uses as much as digits as its factorization.

1355079780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92968 (or 92951 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 45.

The square root of 1355079780 is about 36811.4082860192. The cubic root of 1355079780 is about 1106.5939418912.

The spelling of 1355079780 in words is "one billion, three hundred fifty-five million, seventy-nine thousand, seven hundred eighty".