238553649990 has 160 divisors (see below), whose sum is σ = 646258181184. Its totient is φ = 63138113280.

The previous prime is 238553649979. The next prime is 238553650001. The reversal of 238553649990 is 99946355832.

238553649990 is a `hidden beast` number, since 2 + 3 + 8 + 5 + 53 + 6 + 499 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (238553649979) and next prime (238553650001).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 172739100 + ... + 172740480.

Almost surely, 2^238553649990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238553649990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323129090592).

238553649990 is an abundant number, since it is smaller than the sum of its proper divisors (407704531194).

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

238553649990 is a wasteful number, since it uses less digits than its factorization.

238553649990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 63.

The spelling of 238553649990 in words is "two hundred thirty-eight billion, five hundred fifty-three million, six hundred forty-nine thousand, nine hundred ninety".