78063221 has 4 divisors (see below), whose sum is σ = 79967244. Its totient is φ = 76159200.

The previous prime is 78063199. The next prime is 78063233. The reversal of 78063221 is 12236087.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12236087 = 1553 ⋅7879.

It can be written as a sum of positive squares in 2 ways, for example, as 36602500 + 41460721 = 6050^2 + 6439^2 .

It is a cyclic number.

It is not a de Polignac number, because 78063221 - 2¹⁰ = 78062197 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 (78063121) 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, 951950 + ... + 952031.

It is an arithmetic number, because the mean of its divisors is an integer number (19991811).

Almost surely, 2^78063221 is an apocalyptic number.

It is an amenable number.

78063221 is a deficient number, since it is larger than the sum of its proper divisors (1904023).

78063221 is a wasteful number, since it uses less digits than its factorization.

78063221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904022.

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

The square root of 78063221 is about 8835.3393256852. The cubic root of 78063221 is about 427.3812736429.

The spelling of 78063221 in words is "seventy-eight million, sixty-three thousand, two hundred twenty-one".