75042639 has 16 divisors (see below), whose sum is σ = 127056640. Its totient is φ = 42881400.

The previous prime is 75042593. The next prime is 75042673. The reversal of 75042639 is 93624057.

It is not a de Polignac number, because 75042639 - 2¹⁹ = 74518351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75042679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198337 + ... + 198714.

It is an arithmetic number, because the mean of its divisors is an integer number (7941040).

Almost surely, 2^75042639 is an apocalyptic number.

75042639 is a deficient number, since it is larger than the sum of its proper divisors (52014001).

75042639 is a wasteful number, since it uses less digits than its factorization.

75042639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397067 (or 397061 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 75042639 is about 8662.7154518661. The cubic root of 75042639 is about 421.7962355671.

The spelling of 75042639 in words is "seventy-five million, forty-two thousand, six hundred thirty-nine".