75878989 has 4 divisors (see below), whose sum is σ = 79872640. Its totient is φ = 71885340.

The previous prime is 75878981. The next prime is 75879019. The reversal of 75878989 is 98987857.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75878989 - 2³ = 75878981 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 (75878981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996797 + ... + 1996834.

It is an arithmetic number, because the mean of its divisors is an integer number (19968160).

Almost surely, 2^75878989 is an apocalyptic number.

It is an amenable number.

75878989 is a deficient number, since it is larger than the sum of its proper divisors (3993651).

75878989 is a wasteful number, since it uses less digits than its factorization.

75878989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993650.

The product of its digits is 10160640, while the sum is 61.

The square root of 75878989 is about 8710.8546653012. The cubic root of 75878989 is about 423.3574226618.

It can be divided in two parts, 75878 and 989, that added together give a palindrome (76867).

The spelling of 75878989 in words is "seventy-five million, eight hundred seventy-eight thousand, nine hundred eighty-nine".