108978257 has 4 divisors (see below), whose sum is σ = 109013940. Its totient is φ = 108942576.

The previous prime is 108978241. The next prime is 108978271. The reversal of 108978257 is 752879801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752879801 = 137 ⋅5495473.

It can be written as a sum of positive squares in 2 ways, for example, as 105042001 + 3936256 = 10249^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 108978257 - 2⁴ = 108978241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108978227) 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, 12782 + ... + 19527.

It is an arithmetic number, because the mean of its divisors is an integer number (27253485).

Almost surely, 2^108978257 is an apocalyptic number.

It is an amenable number.

108978257 is a deficient number, since it is larger than the sum of its proper divisors (35683).

108978257 is an equidigital number, since it uses as much as digits as its factorization.

108978257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35682.

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 108978257 is about 10439.2651561305. The cubic root of 108978257 is about 477.6538535497.

The spelling of 108978257 in words is "one hundred eight million, nine hundred seventy-eight thousand, two hundred fifty-seven".