1263979080 has 384 divisors, whose sum is σ = 5246841600. Its totient is φ = 266499072.

The previous prime is 1263979063. The next prime is 1263979081. The reversal of 1263979080 is 809793621.

1263979080 is a `hidden beast` number, since 1 + 2 + 639 + 7 + 9 + 0 + 8 + 0 = 666.

It is a super-2 number, since 2×1263979080² = 3195286229355292800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1263979081) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 883806 + ... + 885234.

It is an arithmetic number, because the mean of its divisors is an integer number (13663650).

Almost surely, 2^1263979080 is an apocalyptic number.

1263979080 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 1263979080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2623420800).

1263979080 is an abundant number, since it is smaller than the sum of its proper divisors (3982862520).

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

1263979080 is a wasteful number, since it uses less digits than its factorization.

1263979080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1263979080 is about 35552.4834575589. The cubic root of 1263979080 is about 1081.2180701364.

It can be divided in two parts, 12639 and 79080, that added together give a palindrome (91719).

The spelling of 1263979080 in words is "one billion, two hundred sixty-three million, nine hundred seventy-nine thousand, eighty".