10217780 has 12 divisors (see below), whose sum is σ = 21457380. Its totient is φ = 4087104.

The previous prime is 10217777. The next prime is 10217803. The reversal of 10217780 is 8771201.

It can be written as a sum of positive squares in 2 ways, for example, as 3857296 + 6360484 = 1964^2 + 2522^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255425 + ... + 255464.

It is an arithmetic number, because the mean of its divisors is an integer number (1788115).

Almost surely, 2^10217780 is an apocalyptic number.

10217780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10217780 is an abundant number, since it is smaller than the sum of its proper divisors (11239600).

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

10217780 is a wasteful number, since it uses less digits than its factorization.

10217780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510898 (or 510896 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 10217780 is about 3196.5262395294. The cubic root of 10217780 is about 216.9962269372.

Adding to 10217780 its reverse (8771201), we get a palindrome (18988981).

It can be divided in two parts, 102 and 17780, that multiplied together give a triangular number (1813560 = T₁₉₀₄).

The spelling of 10217780 in words is "ten million, two hundred seventeen thousand, seven hundred eighty".