78489937 has 4 divisors (see below), whose sum is σ = 79108096. Its totient is φ = 77871780.

The previous prime is 78489911. The next prime is 78489941. The reversal of 78489937 is 73998487.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73998487 = 97 ⋅762871.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78489937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78489967) 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 3 ways as a sum of consecutive naturals, for example, 308889 + ... + 309142.

It is an arithmetic number, because the mean of its divisors is an integer number (19777024).

Almost surely, 2^78489937 is an apocalyptic number.

It is an amenable number.

78489937 is a deficient number, since it is larger than the sum of its proper divisors (618159).

78489937 is a wasteful number, since it uses less digits than its factorization.

78489937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618158.

The product of its digits is 3048192, while the sum is 55.

The square root of 78489937 is about 8859.4546671903. The cubic root of 78489937 is about 428.1585886376.

The spelling of 78489937 in words is "seventy-eight million, four hundred eighty-nine thousand, nine hundred thirty-seven".