1265678720 has 32 divisors (see below), whose sum is σ = 3025764720. Its totient is φ = 506271232.

The previous prime is 1265678717. The next prime is 1265678723. The reversal of 1265678720 is 278765621.

It is an interprime number because it is at equal distance from previous prime (1265678717) and next prime (1265678723).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265678723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988172 + ... + 989451.

Almost surely, 2^1265678720 is an apocalyptic number.

1265678720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265678720 is an abundant number, since it is smaller than the sum of its proper divisors (1760086000).

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

1265678720 is an equidigital number, since it uses as much as digits as its factorization.

1265678720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977642 (or 1977630 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 1265678720 is about 35576.3786802423. The cubic root of 1265678720 is about 1081.7024817406.

The spelling of 1265678720 in words is "one billion, two hundred sixty-five million, six hundred seventy-eight thousand, seven hundred twenty".