1228657530 has 16 divisors (see below), whose sum is σ = 2948778144. Its totient is φ = 327642000.

The previous prime is 1228657487. The next prime is 1228657531. The reversal of 1228657530 is 357568221.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1228657531) 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, 20477596 + ... + 20477655.

It is an arithmetic number, because the mean of its divisors is an integer number (184298634).

Almost surely, 2^1228657530 is an apocalyptic number.

1228657530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1228657530 is an abundant number, since it is smaller than the sum of its proper divisors (1720120614).

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

1228657530 is a wasteful number, since it uses less digits than its factorization.

1228657530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40955261.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 1228657530 is about 35052.2114851545. The cubic root of 1228657530 is about 1071.0513235175.

The spelling of 1228657530 in words is "one billion, two hundred twenty-eight million, six hundred fifty-seven thousand, five hundred thirty".