998877641 has 8 divisors (see below), whose sum is σ = 1031549064. Its totient is φ = 966504960.

The previous prime is 998877637. The next prime is 998877647. The reversal of 998877641 is 146778899.

It can be written as a sum of positive squares in 4 ways, for example, as 633616 + 998244025 = 796^2 + 31595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998877641 - 2² = 998877637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (998877647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67880 + ... + 81273.

It is an arithmetic number, because the mean of its divisors is an integer number (128943633).

Almost surely, 2^998877641 is an apocalyptic number.

It is an amenable number.

998877641 is a deficient number, since it is larger than the sum of its proper divisors (32671423).

998877641 is a wasteful number, since it uses less digits than its factorization.

998877641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149371.

The product of its digits is 6096384, while the sum is 59.

The square root of 998877641 is about 31605.0255655647. The cubic root of 998877641 is about 999.6257402805.

The spelling of 998877641 in words is "nine hundred ninety-eight million, eight hundred seventy-seven thousand, six hundred forty-one".