2528577397 has 4 divisors (see below), whose sum is σ = 2528903916. Its totient is φ = 2528250880.

The previous prime is 2528577377. The next prime is 2528577407. The reversal of 2528577397 is 7937758252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1533427281 + 995150116 = 39159^2 + 31546^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528577397 - 2¹⁹ = 2528053109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528577347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151354 + ... + 167227.

It is an arithmetic number, because the mean of its divisors is an integer number (632225979).

Almost surely, 2^2528577397 is an apocalyptic number.

It is an amenable number.

2528577397 is a deficient number, since it is larger than the sum of its proper divisors (326519).

2528577397 is an equidigital number, since it uses as much as digits as its factorization.

2528577397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326518.

The product of its digits is 7408800, while the sum is 55.

The square root of 2528577397 is about 50284.9619369449. The cubic root of 2528577397 is about 1362.3606271264.

The spelling of 2528577397 in words is "two billion, five hundred twenty-eight million, five hundred seventy-seven thousand, three hundred ninety-seven".