781400000 has 84 divisors (see below), whose sum is σ = 1938610296. Its totient is φ = 312480000.

The previous prime is 781399973. The next prime is 781400063. The reversal of 781400000 is 4187.

It is a happy number.

781400000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781400000² = 1221171920000000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198047 + ... + 201953.

It is an arithmetic number, because the mean of its divisors is an integer number (23078694).

Almost surely, 2^781400000 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 781400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969305148).

781400000 is an abundant number, since it is smaller than the sum of its proper divisors (1157210296).

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

781400000 is an frugal number, since it uses more digits than its factorization.

781400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 781400000 is about 27953.5328715352. The cubic root of 781400000 is about 921.0668153920.

Adding to 781400000 its reverse (4187), we get a palindrome (781404187).

The spelling of 781400000 in words is "seven hundred eighty-one million, four hundred thousand".