781342965 has 48 divisors (see below), whose sum is σ = 1464463728. Its totient is φ = 383090688.

The previous prime is 781342957. The next prime is 781342973. The reversal of 781342965 is 569243187.

It is an interprime number because it is at equal distance from previous prime (781342957) and next prime (781342973).

It can be written as a sum of positive squares in 8 ways, for example, as 1425636 + 779917329 = 1194^2 + 27927^2 .

It is not a de Polignac number, because 781342965 - 2³ = 781342957 is a prime.

It is a super-2 number, since 2×781342965² = 1220993657909982450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 781342965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147747 + ... + 152943.

It is an arithmetic number, because the mean of its divisors is an integer number (30509661).

Almost surely, 2^781342965 is an apocalyptic number.

It is an amenable number.

781342965 is a deficient number, since it is larger than the sum of its proper divisors (683120763).

781342965 is a wasteful number, since it uses less digits than its factorization.

781342965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5478 (or 5475 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 781342965 is about 27952.5126777540. The cubic root of 781342965 is about 921.0444050499.

The spelling of 781342965 in words is "seven hundred eighty-one million, three hundred forty-two thousand, nine hundred sixty-five".