2547728989 has 16 divisors (see below), whose sum is σ = 2792165040. Its totient is φ = 2310312960.

The previous prime is 2547728983. The next prime is 2547729007. The reversal of 2547728989 is 9898277452.

It can be written as a sum of positive squares in 8 ways, for example, as 1911176089 + 636552900 = 43717^2 + 25230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2547728989 - 2⁷ = 2547728861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2547728983) 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, 877989 + ... + 880885.

It is an arithmetic number, because the mean of its divisors is an integer number (174510315).

Almost surely, 2^2547728989 is an apocalyptic number.

It is an amenable number.

2547728989 is a deficient number, since it is larger than the sum of its proper divisors (244436051).

2547728989 is a wasteful number, since it uses less digits than its factorization.

2547728989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080.

The product of its digits is 20321280, while the sum is 61.

The square root of 2547728989 is about 50475.0333234164. The cubic root of 2547728989 is about 1365.7915125689.

The spelling of 2547728989 in words is "two billion, five hundred forty-seven million, seven hundred twenty-eight thousand, nine hundred eighty-nine".