102788557 has 4 divisors (see below), whose sum is σ = 106333020. Its totient is φ = 99244096.

The previous prime is 102788549. The next prime is 102788563. The reversal of 102788557 is 755887201.

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 56942116 + 45846441 = 7546^2 + 6771^2 .

It is a cyclic number.

It is not a de Polignac number, because 102788557 - 2³ = 102788549 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 (102788507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1772188 + ... + 1772245.

It is an arithmetic number, because the mean of its divisors is an integer number (26583255).

Almost surely, 2^102788557 is an apocalyptic number.

It is an amenable number.

102788557 is a deficient number, since it is larger than the sum of its proper divisors (3544463).

102788557 is an equidigital number, since it uses as much as digits as its factorization.

102788557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544462.

The product of its (nonzero) digits is 156800, while the sum is 43.

The square root of 102788557 is about 10138.4691645238. The cubic root of 102788557 is about 468.4338347515.

The spelling of 102788557 in words is "one hundred two million, seven hundred eighty-eight thousand, five hundred fifty-seven".