781320002 has 16 divisors (see below), whose sum is σ = 1195471872. Its totient is φ = 382903920.

The previous prime is 781319989. The next prime is 781320037. The reversal of 781320002 is 200023187.

It is a super-2 number, since 2×781320002² = 1220921891050560008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781320002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2552 + ... + 39612.

It is an arithmetic number, because the mean of its divisors is an integer number (74716992).

Almost surely, 2^781320002 is an apocalyptic number.

781320002 is a deficient number, since it is larger than the sum of its proper divisors (414151870).

781320002 is a wasteful number, since it uses less digits than its factorization.

781320002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37273.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 781320002 is about 27952.1019245423. The cubic root of 781320002 is about 921.0353820597.

Adding to 781320002 its reverse (200023187), we get a palindrome (981343189).

The spelling of 781320002 in words is "seven hundred eighty-one million, three hundred twenty thousand, two".