98778857 has 4 divisors (see below), whose sum is σ = 104589396. Its totient is φ = 92968320.

The previous prime is 98778851. The next prime is 98778871. The reversal of 98778857 is 75887789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75887789 = 313 ⋅242453.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 60388441 = 6196^2 + 7771^2 .

It is a cyclic number.

It is not a de Polignac number, because 98778857 - 2⁶ = 98778793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 98778796 and 98778805.

It is not an unprimeable number, because it can be changed into a prime (98778851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2905244 + ... + 2905277.

It is an arithmetic number, because the mean of its divisors is an integer number (26147349).

Almost surely, 2^98778857 is an apocalyptic number.

It is an amenable number.

98778857 is a deficient number, since it is larger than the sum of its proper divisors (5810539).

98778857 is a wasteful number, since it uses less digits than its factorization.

98778857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5810538.

The product of its digits is 7902720, while the sum is 59.

The square root of 98778857 is about 9938.7553043628. The cubic root of 98778857 is about 462.2617923081.

The spelling of 98778857 in words is "ninety-eight million, seven hundred seventy-eight thousand, eight hundred fifty-seven".