1263612720 has 160 divisors (see below), whose sum is σ = 4164965568. Its totient is φ = 315817984.

The previous prime is 1263612683. The next prime is 1263612739. The reversal of 1263612720 is 272163621.

It is a super-2 number, since 2×1263612720² = 3193434212291596800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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, 1292872 + ... + 1293848.

Almost surely, 2^1263612720 is an apocalyptic number.

1263612720 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 1263612720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2082482784).

1263612720 is an abundant number, since it is smaller than the sum of its proper divisors (2901352848).

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

1263612720 is a wasteful number, since it uses less digits than its factorization.

1263612720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1321 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1263612720 is about 35547.3307014746. The cubic root of 1263612720 is about 1081.1135975927.

The spelling of 1263612720 in words is "one billion, two hundred sixty-three million, six hundred twelve thousand, seven hundred twenty".