1780320078 has 12 divisors (see below), whose sum is σ = 3857360208. Its totient is φ = 593440020.

The previous prime is 1780320077. The next prime is 1780320089. The reversal of 1780320078 is 8700230871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780320077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49453318 + ... + 49453353.

It is an arithmetic number, because the mean of its divisors is an integer number (321446684).

Almost surely, 2^1780320078 is an apocalyptic number.

1780320078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1780320078 is an abundant number, since it is smaller than the sum of its proper divisors (2077040130).

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

1780320078 is a wasteful number, since it uses less digits than its factorization.

1780320078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98906679 (or 98906676 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 1780320078 is about 42193.8393370407. The cubic root of 1780320078 is about 1211.9909117706.

The spelling of 1780320078 in words is "one billion, seven hundred eighty million, three hundred twenty thousand, seventy-eight".