238890780 has 72 divisors (see below), whose sum is σ = 726677952. Its totient is φ = 63524736.

The previous prime is 238890779. The next prime is 238890787. The reversal of 238890780 is 87098832.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238890787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69789 + ... + 73131.

Almost surely, 2^238890780 is an apocalyptic number.

238890780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238890780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363338976).

238890780 is an abundant number, since it is smaller than the sum of its proper divisors (487787172).

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

238890780 is a wasteful number, since it uses less digits than its factorization.

238890780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3755 (or 3750 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 238890780 is about 15456.0920028318. The cubic root of 238890780 is about 620.4876323304.

The spelling of 238890780 in words is "two hundred thirty-eight million, eight hundred ninety thousand, seven hundred eighty".