781121348 has 72 divisors (see below), whose sum is σ = 1638645120. Its totient is φ = 324717120.

The previous prime is 781121347. The next prime is 781121371. The reversal of 781121348 is 843121187.

It is a super-2 number, since 2×781121348² = 1220301120602674208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781121347) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 944111 + ... + 944937.

It is an arithmetic number, because the mean of its divisors is an integer number (22758960).

Almost surely, 2^781121348 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 781121348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819322560).

781121348 is an abundant number, since it is smaller than the sum of its proper divisors (857523772).

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

781121348 is a wasteful number, since it uses less digits than its factorization.

781121348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 976 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 781121348 is about 27948.5482270547. The cubic root of 781121348 is about 920.9573163626.

The spelling of 781121348 in words is "seven hundred eighty-one million, one hundred twenty-one thousand, three hundred forty-eight".