1265332620 has 96 divisors (see below), whose sum is σ = 3640234752. Its totient is φ = 328220928.

The previous prime is 1265332619. The next prime is 1265332639. The reversal of 1265332620 is 262335621.

1265332620 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 729274 + ... + 731006.

It is an arithmetic number, because the mean of its divisors is an integer number (37919112).

Almost surely, 2^1265332620 is an apocalyptic number.

1265332620 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 1265332620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1820117376).

1265332620 is an abundant number, since it is smaller than the sum of its proper divisors (2374902132).

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

1265332620 is a wasteful number, since it uses less digits than its factorization.

1265332620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2069 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 1265332620 is about 35571.5141651294. The cubic root of 1265332620 is about 1081.6038755270.

The spelling of 1265332620 in words is "one billion, two hundred sixty-five million, three hundred thirty-two thousand, six hundred twenty".