1263654864 has 40 divisors (see below), whose sum is σ = 3627158720. Its totient is φ = 421218144.

The previous prime is 1263654853. The next prime is 1263654877. The reversal of 1263654864 is 4684563621.

1263654864 is a `hidden beast` number, since 1 + 2 + 636 + 5 + 4 + 8 + 6 + 4 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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, 1462132 + ... + 1462995.

It is an arithmetic number, because the mean of its divisors is an integer number (90678968).

Almost surely, 2^1263654864 is an apocalyptic number.

It is an amenable number.

1263654864 is an abundant number, since it is smaller than the sum of its proper divisors (2363503856).

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

1263654864 is a wasteful number, since it uses less digits than its factorization.

1263654864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925144 (or 2925132 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 1263654864 is about 35547.9234836579. The cubic root of 1263654864 is about 1081.1256165560.

The spelling of 1263654864 in words is "one billion, two hundred sixty-three million, six hundred fifty-four thousand, eight hundred sixty-four".