1266479720 has 64 divisors (see below), whose sum is σ = 3137270400. Its totient is φ = 456295680.

The previous prime is 1266479717. The next prime is 1266479741. The reversal of 1266479720 is 279746621.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34757 + ... + 61163.

It is an arithmetic number, because the mean of its divisors is an integer number (49019850).

Almost surely, 2^1266479720 is an apocalyptic number.

1266479720 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 1266479720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1568635200).

1266479720 is an abundant number, since it is smaller than the sum of its proper divisors (1870790680).

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

1266479720 is a wasteful number, since it uses less digits than its factorization.

1266479720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26538 (or 26534 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 1266479720 is about 35587.6343692581. The cubic root of 1266479720 is about 1081.9306230950.

The spelling of 1266479720 in words is "one billion, two hundred sixty-six million, four hundred seventy-nine thousand, seven hundred twenty".