238428660 has 24 divisors (see below), whose sum is σ = 667600416. Its totient is φ = 63580960.

The previous prime is 238428647. The next prime is 238428661. The reversal of 238428660 is 66824832.

238428660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238428661) 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, 1986846 + ... + 1986965.

It is an arithmetic number, because the mean of its divisors is an integer number (27816684).

Almost surely, 2^238428660 is an apocalyptic number.

238428660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

238428660 is an abundant number, since it is smaller than the sum of its proper divisors (429171756).

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

238428660 is a wasteful number, since it uses less digits than its factorization.

238428660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973823 (or 3973821 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 238428660 is about 15441.1353209536. The cubic root of 238428660 is about 620.0872752617.

The spelling of 238428660 in words is "two hundred thirty-eight million, four hundred twenty-eight thousand, six hundred sixty".