98780005 has 4 divisors (see below), whose sum is σ = 118536012. Its totient is φ = 79024000.

The previous prime is 98779951. The next prime is 98780027. The reversal of 98780005 is 50008789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50008789 = 29 ⋅1724441.

It can be written as a sum of positive squares in 2 ways, for example, as 54184321 + 44595684 = 7361^2 + 6678^2 .

It is not a de Polignac number, because 98780005 - 2⁹ = 98779493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9877996 + ... + 9878005.

It is an arithmetic number, because the mean of its divisors is an integer number (29634003).

Almost surely, 2^98780005 is an apocalyptic number.

It is an amenable number.

98780005 is a deficient number, since it is larger than the sum of its proper divisors (19756007).

98780005 is a wasteful number, since it uses less digits than its factorization.

98780005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19756006.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 98780005 is about 9938.8130579059. The cubic root of 98780005 is about 462.2635830911.

The spelling of 98780005 in words is "ninety-eight million, seven hundred eighty thousand, five".