98740721 has 4 divisors (see below), whose sum is σ = 98857332. Its totient is φ = 98624112.

The previous prime is 98740703. The next prime is 98740723. The reversal of 98740721 is 12704789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12704789 = 53 ⋅239713.

It can be written as a sum of positive squares in 2 ways, for example, as 23658496 + 75082225 = 4864^2 + 8665^2 .

It is a cyclic number.

It is not a de Polignac number, because 98740721 - 2⁶ = 98740657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (98740723) 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, 57026 + ... + 58731.

It is an arithmetic number, because the mean of its divisors is an integer number (24714333).

Almost surely, 2^98740721 is an apocalyptic number.

It is an amenable number.

98740721 is a deficient number, since it is larger than the sum of its proper divisors (116611).

98740721 is a wasteful number, since it uses less digits than its factorization.

98740721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116610.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 98740721 is about 9936.8365690495. The cubic root of 98740721 is about 462.2022954839.

The spelling of 98740721 in words is "ninety-eight million, seven hundred forty thousand, seven hundred twenty-one".