1328557977 has 16 divisors (see below), whose sum is σ = 2010113280. Its totient is φ = 866859696.

The previous prime is 1328557921. The next prime is 1328557987. The reversal of 1328557977 is 7797558231.

It is a happy number.

1328557977 is a `hidden beast` number, since 13 + 2 + 8 + 557 + 9 + 77 = 666.

It is not a de Polignac number, because 1328557977 - 2¹⁶ = 1328492441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1328557907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522198 + ... + 524735.

It is an arithmetic number, because the mean of its divisors is an integer number (125632080).

Almost surely, 2^1328557977 is an apocalyptic number.

It is an amenable number.

1328557977 is a deficient number, since it is larger than the sum of its proper divisors (681555303).

1328557977 is a wasteful number, since it uses less digits than its factorization.

1328557977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046989 (or 1046983 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 54.

The square root of 1328557977 is about 36449.3892541425. The cubic root of 1328557977 is about 1099.3268545436.

The spelling of 1328557977 in words is "one billion, three hundred twenty-eight million, five hundred fifty-seven thousand, nine hundred seventy-seven".