75210138 has 24 divisors (see below), whose sum is σ = 170041248. Its totient is φ = 23979912.

The previous prime is 75210131. The next prime is 75210143. The reversal of 75210138 is 83101257.

75210138 is a `hidden beast` number, since 7 + 521 + 0 + 138 = 666.

It is not an unprimeable number, because it can be changed into a prime (75210131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90420 + ... + 91247.

It is an arithmetic number, because the mean of its divisors is an integer number (7085052).

Almost surely, 2^75210138 is an apocalyptic number.

75210138 is an abundant number, since it is smaller than the sum of its proper divisors (94831110).

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

75210138 is a wasteful number, since it uses less digits than its factorization.

75210138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181698 (or 181695 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 75210138 is about 8672.3778746086. The cubic root of 75210138 is about 422.1098259408.

The spelling of 75210138 in words is "seventy-five million, two hundred ten thousand, one hundred thirty-eight".