988428721 has 16 divisors (see below), whose sum is σ = 1170460800. Its totient is φ = 816697728.

The previous prime is 988428709. The next prime is 988428731. The reversal of 988428721 is 127824889.

It is not a de Polignac number, because 988428721 - 2²⁵ = 954874289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988428731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135085 + ... + 142213.

It is an arithmetic number, because the mean of its divisors is an integer number (73153800).

Almost surely, 2^988428721 is an apocalyptic number.

It is an amenable number.

988428721 is a deficient number, since it is larger than the sum of its proper divisors (182032079).

988428721 is a wasteful number, since it uses less digits than its factorization.

988428721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7848.

The product of its digits is 516096, while the sum is 49.

The square root of 988428721 is about 31439.2862673439. The cubic root of 988428721 is about 996.1279334518.

The spelling of 988428721 in words is "nine hundred eighty-eight million, four hundred twenty-eight thousand, seven hundred twenty-one".