1228479090 has 16 divisors (see below), whose sum is σ = 2948349888. Its totient is φ = 327594416.

The previous prime is 1228479079. The next prime is 1228479097. The reversal of 1228479090 is 909748221.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1228479097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20474622 + ... + 20474681.

It is an arithmetic number, because the mean of its divisors is an integer number (184271868).

Almost surely, 2^1228479090 is an apocalyptic number.

1228479090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1228479090 is an abundant number, since it is smaller than the sum of its proper divisors (1719870798).

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

1228479090 is a wasteful number, since it uses less digits than its factorization.

1228479090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40949313.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1228479090 is about 35049.6660469112. Note that the first 3 decimals coincide. The cubic root of 1228479090 is about 1070.9994708120. Note that the first 3 decimals are identical.

The spelling of 1228479090 in words is "one billion, two hundred twenty-eight million, four hundred seventy-nine thousand, ninety".