98780081 has 4 divisors (see below), whose sum is σ = 104590692. Its totient is φ = 92969472.

The previous prime is 98780063. The next prime is 98780089. The reversal of 98780081 is 18008789.

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 46362481 + 52417600 = 6809^2 + 7240^2 .

It is a cyclic number.

It is not a de Polignac number, because 98780081 - 2²⁶ = 31671217 is a prime.

It is a super-2 number, since 2×98780081² = 19515008804733122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98780089) 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, 2905280 + ... + 2905313.

It is an arithmetic number, because the mean of its divisors is an integer number (26147673).

Almost surely, 2^98780081 is an apocalyptic number.

It is an amenable number.

98780081 is a deficient number, since it is larger than the sum of its proper divisors (5810611).

98780081 is a wasteful number, since it uses less digits than its factorization.

98780081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810610.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 98780081 is about 9938.8168812993. The cubic root of 98780081 is about 462.2637016442.

The spelling of 98780081 in words is "ninety-eight million, seven hundred eighty thousand, eighty-one".