98945721 has 24 divisors (see below), whose sum is σ = 166023104. Its totient is φ = 55611360.

The previous prime is 98945719. The next prime is 98945779. The reversal of 98945721 is 12754989.

It is not a de Polignac number, because 98945721 - 2¹ = 98945719 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98925721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9031 + ... + 16716.

Almost surely, 2^98945721 is an apocalyptic number.

It is an amenable number.

98945721 is a deficient number, since it is larger than the sum of its proper divisors (67077383).

98945721 is a wasteful number, since it uses less digits than its factorization.

98945721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25821 (or 25818 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 98945721 is about 9947.1463747147. The cubic root of 98945721 is about 462.5219406197.

The spelling of 98945721 in words is "ninety-eight million, nine hundred forty-five thousand, seven hundred twenty-one".