1263887645 has 8 divisors (see below), whose sum is σ = 1516922880. Its totient is φ = 1010938320.

The previous prime is 1263887633. The next prime is 1263887749. The reversal of 1263887645 is 5467883621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1263887645 - 2¹² = 1263883549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263887593 and 1263887602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17240 + ... + 53150.

It is an arithmetic number, because the mean of its divisors is an integer number (189615360).

Almost surely, 2^1263887645 is an apocalyptic number.

It is an amenable number.

1263887645 is a deficient number, since it is larger than the sum of its proper divisors (253035235).

1263887645 is an equidigital number, since it uses as much as digits as its factorization.

1263887645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42955.

The product of its digits is 1935360, while the sum is 50.

The square root of 1263887645 is about 35551.1975185084. The cubic root of 1263887645 is about 1081.1919980915.

The spelling of 1263887645 in words is "one billion, two hundred sixty-three million, eight hundred eighty-seven thousand, six hundred forty-five".