78248279 has 4 divisors (see below), whose sum is σ = 79913184. Its totient is φ = 76583376.

The previous prime is 78248273. The next prime is 78248353. The reversal of 78248279 is 97284287.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78248279 - 2¹⁶ = 78182743 is a prime.

It is a super-2 number, since 2×78248279² = 12245586332923682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1664857 = 78248279 / (7 + 8 + 2 + 4 + 8 + 2 + 7 + 9).

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78248273) 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, 832382 + ... + 832475.

It is an arithmetic number, because the mean of its divisors is an integer number (19978296).

Almost surely, 2^78248279 is an apocalyptic number.

78248279 is a deficient number, since it is larger than the sum of its proper divisors (1664905).

78248279 is a wasteful number, since it uses less digits than its factorization.

78248279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664904.

The product of its digits is 451584, while the sum is 47.

The square root of 78248279 is about 8845.8057292708. The cubic root of 78248279 is about 427.7187262328.

The spelling of 78248279 in words is "seventy-eight million, two hundred forty-eight thousand, two hundred seventy-nine".