780434885 has 8 divisors (see below), whose sum is σ = 943358616. Its totient is φ = 619790080.

The previous prime is 780434881. The next prime is 780434903. The reversal of 780434885 is 588434087.

It can be written as a sum of positive squares in 4 ways, for example, as 307546369 + 472888516 = 17537^2 + 21746^2 .

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

It is not a de Polignac number, because 780434885 - 2² = 780434881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780434881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568976 + ... + 570345.

It is an arithmetic number, because the mean of its divisors is an integer number (117919827).

Almost surely, 2^780434885 is an apocalyptic number.

It is an amenable number.

780434885 is a deficient number, since it is larger than the sum of its proper divisors (162923731).

780434885 is a wasteful number, since it uses less digits than its factorization.

780434885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139463.

The product of its (nonzero) digits is 860160, while the sum is 47.

The square root of 780434885 is about 27936.2646930473. The cubic root of 780434885 is about 920.6874528681.

It can be divided in two parts, 78043 and 4885, that added together give a palindrome (82928).

The spelling of 780434885 in words is "seven hundred eighty million, four hundred thirty-four thousand, eight hundred eighty-five".