1264353644 has 12 divisors (see below), whose sum is σ = 2213754144. Its totient is φ = 631852464.

The previous prime is 1264353617. The next prime is 1264353661. The reversal of 1264353644 is 4463534621.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1264353598 and 1264353607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72212 + ... + 87995.

It is an arithmetic number, because the mean of its divisors is an integer number (184479512).

Almost surely, 2^1264353644 is an apocalyptic number.

It is an amenable number.

1264353644 is a deficient number, since it is larger than the sum of its proper divisors (949400500).

1264353644 is a wasteful number, since it uses less digits than its factorization.

1264353644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162184 (or 162182 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

The square root of 1264353644 is about 35557.7508287574. The cubic root of 1264353644 is about 1081.3248612941.

The spelling of 1264353644 in words is "one billion, two hundred sixty-four million, three hundred fifty-three thousand, six hundred forty-four".