1265690000 has 100 divisors (see below), whose sum is σ = 3198176256. Its totient is φ = 484176000.

The previous prime is 1265689951. The next prime is 1265690009. The reversal of 1265690000 is 965621.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×1265690000² = 3203942352200000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265690009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 227249 + ... + 232751.

Almost surely, 2^1265690000 is an apocalyptic number.

1265690000 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 1265690000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1599088128).

1265690000 is an abundant number, since it is smaller than the sum of its proper divisors (1932486256).

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

1265690000 is an equidigital number, since it uses as much as digits as its factorization.

1265690000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5554 (or 5533 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1265690000 is about 35576.5372120447. The cubic root of 1265690000 is about 1081.7056951858.

The spelling of 1265690000 in words is "one billion, two hundred sixty-five million, six hundred ninety thousand".