1263571428 has 72 divisors (see below), whose sum is σ = 3434374944. Its totient is φ = 360528000.

The previous prime is 1263571417. The next prime is 1263571433. The reversal of 1263571428 is 8241753621.

It is a super-2 number, since 2×1263571428² = 3193225507315918368, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 852448 + ... + 853928.

It is an arithmetic number, because the mean of its divisors is an integer number (47699652).

Almost surely, 2^1263571428 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 1263571428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717187472).

1263571428 is an abundant number, since it is smaller than the sum of its proper divisors (2170803516).

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

1263571428 is a wasteful number, since it uses less digits than its factorization.

1263571428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953 (or 2944 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 1263571428 is about 35546.7498936260. The cubic root of 1263571428 is about 1081.1018213503.

The spelling of 1263571428 in words is "one billion, two hundred sixty-three million, five hundred seventy-one thousand, four hundred twenty-eight".