780000000 has 288 divisors, whose sum is σ = 2794524096. Its totient is φ = 192000000.

The previous prime is 779999999. The next prime is 780000017. The reversal of 780000000 is 87.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 1300 × 500 × 1200.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59999994 + ... + 60000006.

Almost surely, 2^780000000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 780000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1397262048).

780000000 is an abundant number, since it is smaller than the sum of its proper divisors (2014524096).

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

780000000 is an frugal number, since it uses more digits than its factorization.

780000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 780000000 is about 27928.4800875379. The cubic root of 780000000 is about 920.5164082516.

Adding to 780000000 its reverse (87), we get a palindrome (780000087).

The spelling of 780000000 in words is "seven hundred eighty million", and thus it is an aban number.