1265472720 has 200 divisors, whose sum is σ = 4423779360. Its totient is φ = 335266560.

The previous prime is 1265472709. The next prime is 1265472743. The reversal of 1265472720 is 272745621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1159375 + ... + 1160465.

Almost surely, 2^1265472720 is an apocalyptic number.

1265472720 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 1265472720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2211889680).

1265472720 is an abundant number, since it is smaller than the sum of its proper divisors (3158306640).

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

1265472720 is a wasteful number, since it uses less digits than its factorization.

1265472720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 1265472720 is about 35573.4833829919. The cubic root of 1265472720 is about 1081.6437931234.

The spelling of 1265472720 in words is "one billion, two hundred sixty-five million, four hundred seventy-two thousand, seven hundred twenty".