780223640 has 32 divisors (see below), whose sum is σ = 2006290080. Its totient is φ = 267505152.

The previous prime is 780223603. The next prime is 780223651. The reversal of 780223640 is 46322087.

780223640 = T₁₀₁₉₂ + T₁₀₁₉₃ + ... + T₁₀₂₀₆.

It is a junction number, because it is equal to n+sod(n) for n = 780223597 and 780223606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1392977 + ... + 1393536.

It is an arithmetic number, because the mean of its divisors is an integer number (62696565).

Almost surely, 2^780223640 is an apocalyptic number.

780223640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

780223640 is an abundant number, since it is smaller than the sum of its proper divisors (1226066440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

780223640 is a wasteful number, since it uses less digits than its factorization.

780223640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786531 (or 2786527 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 780223640 is about 27932.4835988496. The cubic root of 780223640 is about 920.6043760369.

The spelling of 780223640 in words is "seven hundred eighty million, two hundred twenty-three thousand, six hundred forty".