1328777928 has 24 divisors (see below), whose sum is σ = 3598773750. Its totient is φ = 442925952.

The previous prime is 1328777911. The next prime is 1328777951. The reversal of 1328777928 is 8297778231.

It can be written as a sum of positive squares in only one way, i.e., 1218149604 + 110628324 = 34902^2 + 10518^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×1328777928³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9227553 + ... + 9227696.

Almost surely, 2^1328777928 is an apocalyptic number.

1328777928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1328777928 is an abundant number, since it is smaller than the sum of its proper divisors (2269995822).

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

1328777928 is a wasteful number, since it uses less digits than its factorization.

1328777928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18455261 (or 18455254 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 1328777928 is about 36452.4063403227. The cubic root of 1328777928 is about 1099.3875179854.

The spelling of 1328777928 in words is "one billion, three hundred twenty-eight million, seven hundred seventy-seven thousand, nine hundred twenty-eight".