781672506 has 16 divisors (see below), whose sum is σ = 1566241248. Its totient is φ = 260074800.

The previous prime is 781672501. The next prime is 781672513. The reversal of 781672506 is 605276187.

781672506 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 2×781672506² = 1222023813272640072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781672501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117160 + ... + 123651.

It is an arithmetic number, because the mean of its divisors is an integer number (97890078).

Almost surely, 2^781672506 is an apocalyptic number.

781672506 is an abundant number, since it is smaller than the sum of its proper divisors (784568742).

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

781672506 is a wasteful number, since it uses less digits than its factorization.

781672506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241357.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 781672506 is about 27958.4067142604. The cubic root of 781672506 is about 921.1738741164.

The spelling of 781672506 in words is "seven hundred eighty-one million, six hundred seventy-two thousand, five hundred six".