781705013 has 8 divisors (see below), whose sum is σ = 793886400. Its totient is φ = 769538880.

The previous prime is 781704997. The next prime is 781705019. The reversal of 781705013 is 310507187.

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 781705013 - 2⁴ = 781704997 is a prime.

It is a super-2 number, since 2×781705013² = 1222125454698660338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781705019) 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, 142088 + ... + 147486.

It is an arithmetic number, because the mean of its divisors is an integer number (99235800).

Almost surely, 2^781705013 is an apocalyptic number.

It is an amenable number.

781705013 is a deficient number, since it is larger than the sum of its proper divisors (12181387).

781705013 is a wasteful number, since it uses less digits than its factorization.

781705013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 781705013 is about 27958.9880539336. The cubic root of 781705013 is about 921.1866433959.

The spelling of 781705013 in words is "seven hundred eighty-one million, seven hundred five thousand, thirteen".