98638640 has 20 divisors (see below), whose sum is σ = 229335024. Its totient is φ = 39455424.

The previous prime is 98638637. The next prime is 98638643. The reversal of 98638640 is 4683689.

It is an interprime number because it is at equal distance from previous prime (98638637) and next prime (98638643).

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 98638591 and 98638600.

It is not an unprimeable number, because it can be changed into a prime (98638643) 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, 616412 + ... + 616571.

Almost surely, 2^98638640 is an apocalyptic number.

It is an amenable number.

98638640 is an abundant number, since it is smaller than the sum of its proper divisors (130696384).

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

98638640 is a wasteful number, since it uses less digits than its factorization.

98638640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232996 (or 1232990 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 98638640 is about 9931.6987469415. The cubic root of 98638640 is about 462.0429612167.

The spelling of 98638640 in words is "ninety-eight million, six hundred thirty-eight thousand, six hundred forty".