781742047 has 4 divisors (see below), whose sum is σ = 784626976. Its totient is φ = 778857120.

The previous prime is 781742041. The next prime is 781742083. The reversal of 781742047 is 740247187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 781742047 - 2¹¹ = 781739999 is a prime.

It is a super-2 number, since 2×781742047² = 1222241256095500418, 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 (781742041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442058 + ... + 1442599.

It is an arithmetic number, because the mean of its divisors is an integer number (196156744).

Almost surely, 2^781742047 is an apocalyptic number.

781742047 is a deficient number, since it is larger than the sum of its proper divisors (2884929).

781742047 is a wasteful number, since it uses less digits than its factorization.

781742047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884928.

The product of its (nonzero) digits is 87808, while the sum is 40.

The square root of 781742047 is about 27959.6503375847. The cubic root of 781742047 is about 921.2011905234.

The spelling of 781742047 in words is "seven hundred eighty-one million, seven hundred forty-two thousand, forty-seven".