1264544928 has 36 divisors (see below), whose sum is σ = 3596050458. Its totient is φ = 421514880.

The previous prime is 1264544927. The next prime is 1264544951. The reversal of 1264544928 is 8294454621.

It is a happy number.

1264544928 is a `hidden beast` number, since 12 + 6 + 4 + 544 + 92 + 8 = 666.

1264544928 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1042773264 + 221771664 = 32292^2 + 14892^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1264544921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2195103 + ... + 2195678.

Almost surely, 2^1264544928 is an apocalyptic number.

1264544928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1264544928 is an abundant number, since it is smaller than the sum of its proper divisors (2331505530).

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

1264544928 is a wasteful number, since it uses less digits than its factorization.

1264544928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390797 (or 4390786 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 1264544928 is about 35560.4404922099. The cubic root of 1264544928 is about 1081.3793897392.

The spelling of 1264544928 in words is "one billion, two hundred sixty-four million, five hundred forty-four thousand, nine hundred twenty-eight".