781299420 has 144 divisors (see below), whose sum is σ = 2509678080. Its totient is φ = 181132160.

The previous prime is 781299419. The next prime is 781299433. The reversal of 781299420 is 24992187.

It is a super-2 number, since 2×781299420² = 1220857567384672800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164641 + ... + 169319.

It is an arithmetic number, because the mean of its divisors is an integer number (17428320).

Almost surely, 2^781299420 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 781299420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254839040).

781299420 is an abundant number, since it is smaller than the sum of its proper divisors (1728378660).

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

781299420 is a wasteful number, since it uses less digits than its factorization.

781299420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736 (or 4723 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 781299420 is about 27951.7337566026. The cubic root of 781299420 is about 921.0272944999.

The spelling of 781299420 in words is "seven hundred eighty-one million, two hundred ninety-nine thousand, four hundred twenty".