781642049 has 8 divisors (see below), whose sum is σ = 786341952. Its totient is φ = 776955760.

The previous prime is 781642027. The next prime is 781642061. The reversal of 781642049 is 940246187.

781642049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 781642049 - 2²⁸ = 513206593 is a prime.

It is a super-2 number, since 2×781642049² = 1221928585529836802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 781641997 and 781642015.

It is not an unprimeable number, because it can be changed into a prime (781642009) 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, 126107 + ... + 132159.

It is an arithmetic number, because the mean of its divisors is an integer number (98292744).

Almost surely, 2^781642049 is an apocalyptic number.

It is an amenable number.

781642049 is a deficient number, since it is larger than the sum of its proper divisors (4699903).

781642049 is a wasteful number, since it uses less digits than its factorization.

781642049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6807.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 781642049 is about 27957.8620248402. The cubic root of 781642049 is about 921.1619097891.

The spelling of 781642049 in words is "seven hundred eighty-one million, six hundred forty-two thousand, forty-nine".