2528378457 has 16 divisors (see below), whose sum is σ = 3763170048. Its totient is φ = 1496713680.

The previous prime is 2528378449. The next prime is 2528378459. The reversal of 2528378457 is 7548738252.

It is not a de Polignac number, because 2528378457 - 2³ = 2528378449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2528378459) 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, 889483 + ... + 892320.

It is an arithmetic number, because the mean of its divisors is an integer number (235198128).

Almost surely, 2^2528378457 is an apocalyptic number.

It is an amenable number.

2528378457 is a deficient number, since it is larger than the sum of its proper divisors (1234791591).

2528378457 is a wasteful number, since it uses less digits than its factorization.

2528378457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781860.

The product of its digits is 3763200, while the sum is 51.

The square root of 2528378457 is about 50282.9837718487. The cubic root of 2528378457 is about 1362.3248975324.

It can be divided in two parts, 25283 and 78457, that added together give a triangular number (103740 = T₄₅₅).

The spelling of 2528378457 in words is "two billion, five hundred twenty-eight million, three hundred seventy-eight thousand, four hundred fifty-seven".