1226500728 has 16 divisors (see below), whose sum is σ = 3066251880. Its totient is φ = 408833568.

The previous prime is 1226500721. The next prime is 1226500747. The reversal of 1226500728 is 8270056221.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226500721) 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, 25552075 + ... + 25552122.

Almost surely, 2^1226500728 is an apocalyptic number.

It is an amenable number.

1226500728 is an abundant number, since it is smaller than the sum of its proper divisors (1839751152).

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

1226500728 is a wasteful number, since it uses less digits than its factorization.

1226500728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51104206 (or 51104202 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1226500728 is about 35021.4324093119. The cubic root of 1226500728 is about 1070.4242437997.

Adding to 1226500728 its reverse (8270056221), we get a palindrome (9496556949).

The spelling of 1226500728 in words is "one billion, two hundred twenty-six million, five hundred thousand, seven hundred twenty-eight".