78490239 has 4 divisors (see below), whose sum is σ = 104653656. Its totient is φ = 52326824.

The previous prime is 78490219. The next prime is 78490259. The reversal of 78490239 is 93209487.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78490219) and next prime (78490259).

It is a cyclic number.

It is not a de Polignac number, because 78490239 - 2⁹ = 78489727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78490239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78490219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13081704 + ... + 13081709.

It is an arithmetic number, because the mean of its divisors is an integer number (26163414).

Almost surely, 2^78490239 is an apocalyptic number.

78490239 is a deficient number, since it is larger than the sum of its proper divisors (26163417).

78490239 is a wasteful number, since it uses less digits than its factorization.

78490239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26163416.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 78490239 is about 8859.4717111124. The cubic root of 78490239 is about 428.1591377684.

The spelling of 78490239 in words is "seventy-eight million, four hundred ninety thousand, two hundred thirty-nine".