98911638 has 128 divisors (see below), whose sum is σ = 271319040. Its totient is φ = 26088480.

The previous prime is 98911633. The next prime is 98911649. The reversal of 98911638 is 83611989.

98911638 is a `hidden beast` number, since 9 + 8 + 9 + 1 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 98911593 and 98911602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98911633) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 269331 + ... + 269697.

It is an arithmetic number, because the mean of its divisors is an integer number (2119680).

Almost surely, 2^98911638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 98911638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135659520).

98911638 is an abundant number, since it is smaller than the sum of its proper divisors (172407402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

98911638 is a wasteful number, since it uses less digits than its factorization.

98911638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 433 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 98911638 is about 9945.4330222469. The cubic root of 98911638 is about 462.4688275070.

The spelling of 98911638 in words is "ninety-eight million, nine hundred eleven thousand, six hundred thirty-eight".