1279497648 has 160 divisors (see below), whose sum is σ = 3909749760. Its totient is φ = 357576960.

The previous prime is 1279497647. The next prime is 1279497649. The reversal of 1279497648 is 8467949721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1279497647) and next prime (1279497649).

It is a super-2 number, since 2×1279497648² = 3274228462475063808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1279497643) 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 31 ways as a sum of consecutive naturals, for example, 1159465 + ... + 1160567.

It is an arithmetic number, because the mean of its divisors is an integer number (24435936).

Almost surely, 2^1279497648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279497648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954874880).

1279497648 is an abundant number, since it is smaller than the sum of its proper divisors (2630252112).

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

1279497648 is a wasteful number, since it uses less digits than its factorization.

1279497648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164 (or 1132 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 57.

The square root of 1279497648 is about 35770.0663684036. The cubic root of 1279497648 is about 1085.6249871021.

The spelling of 1279497648 in words is "one billion, two hundred seventy-nine million, four hundred ninety-seven thousand, six hundred forty-eight".