781315560 has 48 divisors (see below), whose sum is σ = 2539276740. Its totient is φ = 208350720.

The previous prime is 781315553. The next prime is 781315567. The reversal of 781315560 is 65513187.

781315560 is a `hidden beast` number, since 7 + 81 + 3 + 15 + 560 = 666.

It is an interprime number because it is at equal distance from previous prime (781315553) and next prime (781315567).

It can be written as a sum of positive squares in 2 ways, for example, as 772061796 + 9253764 = 27786^2 + 3042^2 .

It is a super-2 number, since 2×781315560² = 1220908008596227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (781315567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1084801 + ... + 1085520.

Almost surely, 2^781315560 is an apocalyptic number.

It is an amenable number.

781315560 is an abundant number, since it is smaller than the sum of its proper divisors (1757961180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781315560 is a wasteful number, since it uses less digits than its factorization.

781315560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170338 (or 2170331 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 781315560 is about 27952.0224670774. The cubic root of 781315560 is about 921.0336366174.

It can be divided in two parts, 781315 and 560, that added together give a triangular number (781875 = T₁₂₅₀).

The spelling of 781315560 in words is "seven hundred eighty-one million, three hundred fifteen thousand, five hundred sixty".