780740005 has 16 divisors (see below), whose sum is σ = 946122480. Its totient is φ = 618467328.

The previous prime is 780740003. The next prime is 780740017. The reversal of 780740005 is 500047087.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 39212644 + 741527361 = 6262^2 + 27231^2 .

It is a cyclic number.

It is not a de Polignac number, because 780740005 - 2¹ = 780740003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780740003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219219 + ... + 222751.

It is an arithmetic number, because the mean of its divisors is an integer number (59132655).

Almost surely, 2^780740005 is an apocalyptic number.

It is an amenable number.

780740005 is a deficient number, since it is larger than the sum of its proper divisors (165382475).

780740005 is a wasteful number, since it uses less digits than its factorization.

780740005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 780740005 is about 27941.7251614856. The cubic root of 780740005 is about 920.8074216869.

The spelling of 780740005 in words is "seven hundred eighty million, seven hundred forty thousand, five".