1264364721 has 12 divisors (see below), whose sum is σ = 1893945872. Its totient is φ = 842909652.

The previous prime is 1264364687. The next prime is 1264364737. The reversal of 1264364721 is 1274634621.

1264364721 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 3 + 647 + 2 + 1 = 666.

1264364721 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1264364721 - 2⁶ = 1264364657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264364221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2601331 + ... + 2601816.

Almost surely, 2^1264364721 is an apocalyptic number.

It is an amenable number.

1264364721 is a deficient number, since it is larger than the sum of its proper divisors (629581151).

1264364721 is an frugal number, since it uses more digits than its factorization.

1264364721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5203162 (or 5203150 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 1264364721 is about 35557.9065891118. The cubic root of 1264364721 is about 1081.3280191133.

The spelling of 1264364721 in words is "one billion, two hundred sixty-four million, three hundred sixty-four thousand, seven hundred twenty-one".