1225064500 has 72 divisors (see below), whose sum is σ = 2941029000. Its totient is φ = 445456000.

The previous prime is 1225064471. The next prime is 1225064513. The reversal of 1225064500 is 54605221.

It can be written as a sum of positive squares in 4 ways, for example, as 120033936 + 1105030564 = 10956^2 + 33242^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50376 + ... + 70624.

It is an arithmetic number, because the mean of its divisors is an integer number (40847625).

Almost surely, 2^1225064500 is an apocalyptic number.

1225064500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225064500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1470514500).

1225064500 is an abundant number, since it is smaller than the sum of its proper divisors (1715964500).

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

1225064500 is a wasteful number, since it uses less digits than its factorization.

1225064500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20290 (or 20267 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1225064500 is about 35000.9214164427. The cubic root of 1225064500 is about 1070.0062596076.

Adding to 1225064500 its reverse (54605221), we get a palindrome (1279669721).

The spelling of 1225064500 in words is "one billion, two hundred twenty-five million, sixty-four thousand, five hundred".