1920228686864 has 20 divisors (see below), whose sum is σ = 3720491157180. Its totient is φ = 960101936640.

The previous prime is 1920228686843. The next prime is 1920228686869. The reversal of 1920228686864 is 4686868220291.

It can be written as a sum of positive squares in 2 ways, for example, as 1210422436864 + 709806250000 = 1100192^2 + 842500^2 .

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1920228686797 and 1920228686806.

It is not an unprimeable number, because it can be changed into a prime (1920228686869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 572444 + ... + 2041604.

It is an arithmetic number, because the mean of its divisors is an integer number (186024557859).

Almost surely, 2^{1920228686864} is an apocalyptic number.

It is an amenable number.

1920228686864 is a deficient number, since it is larger than the sum of its proper divisors (1800262470316).

1920228686864 is a wasteful number, since it uses less digits than its factorization.

1920228686864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550858 (or 1550852 counting only the distinct ones).

The product of its (nonzero) digits is 31850496, while the sum is 62.

The spelling of 1920228686864 in words is "one trillion, nine hundred twenty billion, two hundred twenty-eight million, six hundred eighty-six thousand, eight hundred sixty-four".