1265180328 has 24 divisors (see below), whose sum is σ = 3426530250. Its totient is φ = 421726752.

The previous prime is 1265180327. The next prime is 1265180347. The reversal of 1265180328 is 8230815621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1237491684 + 27688644 = 35178^2 + 5262^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×1265180328³ (a number of 28 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1265180292 and 1265180301.

It is not an unprimeable number, because it can be changed into a prime (1265180327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8785903 + ... + 8786046.

Almost surely, 2^1265180328 is an apocalyptic number.

1265180328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1265180328 is an abundant number, since it is smaller than the sum of its proper divisors (2161349922).

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

1265180328 is a wasteful number, since it uses less digits than its factorization.

1265180328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17571961 (or 17571954 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1265180328 is about 35569.3734552634. The cubic root of 1265180328 is about 1081.5604808170.

Adding to 1265180328 its reverse (8230815621), we get a palindrome (9495995949).

The spelling of 1265180328 in words is "one billion, two hundred sixty-five million, one hundred eighty thousand, three hundred twenty-eight".