1228120641 has 48 divisors (see below), whose sum is σ = 1966768128. Its totient is φ = 732290400.

The previous prime is 1228120633. The next prime is 1228120679. The reversal of 1228120641 is 1460218221.

1228120641 is a `hidden beast` number, since 1 + 2 + 2 + 8 + 12 + 0 + 641 = 666.

It is not a de Polignac number, because 1228120641 - 2³ = 1228120633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1228120631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2022960 + ... + 2023566.

It is an arithmetic number, because the mean of its divisors is an integer number (40974336).

Almost surely, 2^1228120641 is an apocalyptic number.

1228120641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1228120641 is a deficient number, since it is larger than the sum of its proper divisors (738647487).

1228120641 is a wasteful number, since it uses less digits than its factorization.

1228120641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 919 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1228120641 is about 35044.5522299829. The cubic root of 1228120641 is about 1070.8952942909.

Adding to 1228120641 its reverse (1460218221), we get a palindrome (2688338862).

The spelling of 1228120641 in words is "one billion, two hundred twenty-eight million, one hundred twenty thousand, six hundred forty-one".