1265225780 has 192 divisors, whose sum is σ = 3383493120. Its totient is φ = 386850816.

The previous prime is 1265225771. The next prime is 1265225783. The reversal of 1265225780 is 875225621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265225783) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11824487 + ... + 11824593.

It is an arithmetic number, because the mean of its divisors is an integer number (17622360).

Almost surely, 2^1265225780 is an apocalyptic number.

1265225780 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 1265225780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691746560).

1265225780 is an abundant number, since it is smaller than the sum of its proper divisors (2118267340).

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

1265225780 is a wasteful number, since it uses less digits than its factorization.

1265225780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 1265225780 is about 35570.0123699725. The cubic root of 1265225780 is about 1081.5734324617.

The spelling of 1265225780 in words is "one billion, two hundred sixty-five million, two hundred twenty-five thousand, seven hundred eighty".