780671005 has 4 divisors (see below), whose sum is σ = 936805212. Its totient is φ = 624536800.

The previous prime is 780670999. The next prime is 780671011. The reversal of 780671005 is 500176087.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (780670999) and next prime (780671011).

It can be written as a sum of positive squares in 2 ways, for example, as 440748036 + 339922969 = 20994^2 + 18437^2 .

It is not a de Polignac number, because 780671005 - 2³ = 780670997 is a prime.

It is a super-3 number, since 3×780671005³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78067096 + ... + 78067105.

It is an arithmetic number, because the mean of its divisors is an integer number (234201303).

Almost surely, 2^780671005 is an apocalyptic number.

It is an amenable number.

780671005 is a deficient number, since it is larger than the sum of its proper divisors (156134207).

780671005 is a wasteful number, since it uses less digits than its factorization.

780671005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156134206.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 780671005 is about 27940.4904216086. The cubic root of 780671005 is about 920.7802946094.

The spelling of 780671005 in words is "seven hundred eighty million, six hundred seventy-one thousand, five".