78026321 has 4 divisors (see below), whose sum is σ = 79929444. Its totient is φ = 76123200.

The previous prime is 78026227. The next prime is 78026329. The reversal of 78026321 is 12362087.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25897921 + 52128400 = 5089^2 + 7220^2 .

It is a cyclic number.

It is not a de Polignac number, because 78026321 - 2¹⁴ = 78009937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78026329) 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, 951500 + ... + 951581.

It is an arithmetic number, because the mean of its divisors is an integer number (19982361).

Almost surely, 2^78026321 is an apocalyptic number.

It is an amenable number.

78026321 is a deficient number, since it is larger than the sum of its proper divisors (1903123).

78026321 is a wasteful number, since it uses less digits than its factorization.

78026321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903122.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 78026321 is about 8833.2508738290. The cubic root of 78026321 is about 427.3139228713.

The spelling of 78026321 in words is "seventy-eight million, twenty-six thousand, three hundred twenty-one".