781887485 has 4 divisors (see below), whose sum is σ = 938264988. Its totient is φ = 625509984.

The previous prime is 781887481. The next prime is 781887497. The reversal of 781887485 is 584788187.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112423609 + 669463876 = 10603^2 + 25874^2 .

It is a cyclic number.

It is not a de Polignac number, because 781887485 - 2² = 781887481 is a prime.

It is a super-2 number, since 2×781887485² = 1222696078399250450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 781887485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781887481) 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, 78188744 + ... + 78188753.

It is an arithmetic number, because the mean of its divisors is an integer number (234566247).

Almost surely, 2^781887485 is an apocalyptic number.

It is an amenable number.

781887485 is a deficient number, since it is larger than the sum of its proper divisors (156377503).

781887485 is a wasteful number, since it uses less digits than its factorization.

781887485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156377502.

The product of its digits is 4014080, while the sum is 56.

The square root of 781887485 is about 27962.2510717574. The cubic root of 781887485 is about 921.2583148018.

The spelling of 781887485 in words is "seven hundred eighty-one million, eight hundred eighty-seven thousand, four hundred eighty-five".