75638639 has 8 divisors (see below), whose sum is σ = 79862640. Its totient is φ = 71438976.

The previous prime is 75638623. The next prime is 75638653. The reversal of 75638639 is 93683657.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75638639 - 2⁴ = 75638623 is a prime.

It is a super-3 number, since 3×75638639³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75638593 and 75638602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75638609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (9982830).

Almost surely, 2^75638639 is an apocalyptic number.

75638639 is a deficient number, since it is larger than the sum of its proper divisors (4224001).

75638639 is a wasteful number, since it uses less digits than its factorization.

75638639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12169.

The product of its digits is 816480, while the sum is 47.

The square root of 75638639 is about 8697.0477174729. The cubic root of 75638639 is about 422.9099488440.

The spelling of 75638639 in words is "seventy-five million, six hundred thirty-eight thousand, six hundred thirty-nine".