780457345 has 8 divisors (see below), whose sum is σ = 959391720. Its totient is φ = 609137280.

The previous prime is 780457303. The next prime is 780457373. The reversal of 780457345 is 543754087.

It can be written as a sum of positive squares in 4 ways, for example, as 35331136 + 745126209 = 5944^2 + 27297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 780457345 - 2¹⁵ = 780424577 is a prime.

It is a super-2 number, since 2×780457345² = 1218227334728898050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1903350 + ... + 1903759.

It is an arithmetic number, because the mean of its divisors is an integer number (119923965).

Almost surely, 2^780457345 is an apocalyptic number.

It is an amenable number.

780457345 is a deficient number, since it is larger than the sum of its proper divisors (178934375).

780457345 is a wasteful number, since it uses less digits than its factorization.

780457345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807155.

The product of its (nonzero) digits is 470400, while the sum is 43.

The square root of 780457345 is about 27936.6666766098. Note that the first 4 decimals coincide. The cubic root of 780457345 is about 920.6962848848.

The spelling of 780457345 in words is "seven hundred eighty million, four hundred fifty-seven thousand, three hundred forty-five".