781109604 has 72 divisors (see below), whose sum is σ = 2223486720. Its totient is φ = 229060800.

The previous prime is 781109569. The next prime is 781109689. The reversal of 781109604 is 406901187.

781109604 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 2×781109604² = 1220264426922073632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19539 + ... + 44090.

It is an arithmetic number, because the mean of its divisors is an integer number (30881760).

Almost surely, 2^781109604 is an apocalyptic number.

It is an amenable number.

781109604 is an abundant number, since it is smaller than the sum of its proper divisors (1442377116).

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

781109604 is a wasteful number, since it uses less digits than its factorization.

781109604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63681 (or 63676 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 781109604 is about 27948.3381259065. The cubic root of 781109604 is about 920.9527008711.

The spelling of 781109604 in words is "seven hundred eighty-one million, one hundred nine thousand, six hundred four".