1268504721 has 24 divisors (see below), whose sum is σ = 2026249056. Its totient is φ = 758255040.

The previous prime is 1268504663. The next prime is 1268504737. The reversal of 1268504721 is 1274058621.

1268504721 is a `hidden beast` number, since 126 + 8 + 504 + 7 + 21 = 666.

It is not a de Polignac number, because 1268504721 - 2¹¹ = 1268502673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1268504791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80535 + ... + 94988.

It is an arithmetic number, because the mean of its divisors is an integer number (84427044).

Almost surely, 2^1268504721 is an apocalyptic number.

1268504721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1268504721 is a deficient number, since it is larger than the sum of its proper divisors (757744335).

1268504721 is a wasteful number, since it uses less digits than its factorization.

1268504721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175613 (or 175610 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1268504721 is about 35616.0739133330. The cubic root of 1268504721 is about 1082.5069565590.

The spelling of 1268504721 in words is "one billion, two hundred sixty-eight million, five hundred four thousand, seven hundred twenty-one".