75820138 has 4 divisors (see below), whose sum is σ = 113730210. Its totient is φ = 37910068.

The previous prime is 75820117. The next prime is 75820139. The reversal of 75820138 is 83102857.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83102857 = 59 ⋅1408523.

It can be written as a sum of positive squares in only one way, i.e., 75637809 + 182329 = 8697^2 + 427^2 .

It is not an unprimeable number, because it can be changed into a prime (75820139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18955033 + ... + 18955036.

Almost surely, 2^75820138 is an apocalyptic number.

75820138 is a deficient number, since it is larger than the sum of its proper divisors (37910072).

75820138 is a wasteful number, since it uses less digits than its factorization.

75820138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37910071.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 75820138 is about 8707.4759833146. The cubic root of 75820138 is about 423.2479437311.

The spelling of 75820138 in words is "seventy-five million, eight hundred twenty thousand, one hundred thirty-eight".