98778689 has 4 divisors (see below), whose sum is σ = 99797124. Its totient is φ = 97760256.

The previous prime is 98778671. The next prime is 98778733. The reversal of 98778689 is 98687789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98687789 = 619 ⋅159431.

It can be written as a sum of positive squares in 2 ways, for example, as 81306289 + 17472400 = 9017^2 + 4180^2 .

It is a cyclic number.

It is not a de Polignac number, because 98778689 - 2¹² = 98774593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98775689) 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, 509072 + ... + 509265.

It is an arithmetic number, because the mean of its divisors is an integer number (24949281).

Almost surely, 2^98778689 is an apocalyptic number.

It is an amenable number.

98778689 is a deficient number, since it is larger than the sum of its proper divisors (1018435).

98778689 is a wasteful number, since it uses less digits than its factorization.

98778689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018434.

The product of its digits is 12192768, while the sum is 62.

The square root of 98778689 is about 9938.7468525967. The cubic root of 98778689 is about 462.2615302412.

The spelling of 98778689 in words is "ninety-eight million, seven hundred seventy-eight thousand, six hundred eighty-nine".