778472287 has 2 divisors, whose sum is σ = 778472288. Its totient is φ = 778472286.

The previous prime is 778472273. The next prime is 778472311. The reversal of 778472287 is 782274877.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778472287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778472987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389236143 + 389236144.

It is an arithmetic number, because the mean of its divisors is an integer number (389236144).

Almost surely, 2^778472287 is an apocalyptic number.

778472287 is a deficient number, since it is larger than the sum of its proper divisors (1).

778472287 is an equidigital number, since it uses as much as digits as its factorization.

778472287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2458624, while the sum is 52.

The square root of 778472287 is about 27901.1162321510. The cubic root of 778472287 is about 919.9150390193.

The spelling of 778472287 in words is "seven hundred seventy-eight million, four hundred seventy-two thousand, two hundred eighty-seven".