1780085740 has 24 divisors (see below), whose sum is σ = 3739624560. Its totient is φ = 711759168.

The previous prime is 1780085729. The next prime is 1780085753. The reversal of 1780085740 is 475800871.

It is a junction number, because it is equal to n+sod(n) for n = 1780085693 and 1780085702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40594 + ... + 72166.

It is an arithmetic number, because the mean of its divisors is an integer number (155817690).

Almost surely, 2^1780085740 is an apocalyptic number.

1780085740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1780085740 is an abundant number, since it is smaller than the sum of its proper divisors (1959538820).

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

1780085740 is a wasteful number, since it uses less digits than its factorization.

1780085740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34401 (or 34399 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 1780085740 is about 42191.0623236723. The cubic root of 1780085740 is about 1211.9377325713.

The spelling of 1780085740 in words is "one billion, seven hundred eighty million, eighty-five thousand, seven hundred forty".