778260287 has 12 divisors (see below), whose sum is σ = 906081120. Its totient is φ = 666521856.

The previous prime is 778260283. The next prime is 778260367. The reversal of 778260287 is 782062877.

It is a happy number.

It is not a de Polignac number, because 778260287 - 2² = 778260283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778260281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59039 + ... + 71007.

It is an arithmetic number, because the mean of its divisors is an integer number (75506760).

Almost surely, 2^778260287 is an apocalyptic number.

778260287 is a deficient number, since it is larger than the sum of its proper divisors (127820833).

778260287 is a wasteful number, since it uses less digits than its factorization.

778260287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13310 (or 13303 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 778260287 is about 27897.3168423058. The cubic root of 778260287 is about 919.8315251518.

The spelling of 778260287 in words is "seven hundred seventy-eight million, two hundred sixty thousand, two hundred eighty-seven".