78082397 has 4 divisors (see below), whose sum is σ = 80601216. Its totient is φ = 75563580.

The previous prime is 78082391. The next prime is 78082399. The reversal of 78082397 is 79328087.

It is a happy number.

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 78082397 - 2²⁶ = 10973533 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 (78082391) 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, 1259363 + ... + 1259424.

It is an arithmetic number, because the mean of its divisors is an integer number (20150304).

Almost surely, 2^78082397 is an apocalyptic number.

It is an amenable number.

78082397 is a deficient number, since it is larger than the sum of its proper divisors (2518819).

78082397 is a wasteful number, since it uses less digits than its factorization.

78082397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518818.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 78082397 is about 8836.4244465734. The cubic root of 78082397 is about 427.4162657610.

The spelling of 78082397 in words is "seventy-eight million, eighty-two thousand, three hundred ninety-seven".