78223973 has 4 divisors (see below), whose sum is σ = 78568800. Its totient is φ = 77879148.

The previous prime is 78223967. The next prime is 78223979. The reversal of 78223973 is 37932287.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37932287 = 17 ⋅2231311.

It is an interprime number because it is at equal distance from previous prime (78223967) and next prime (78223979).

It is a cyclic number.

It is not a de Polignac number, because 78223973 - 2⁶ = 78223909 is a prime.

It is a super-2 number, since 2×78223973² = 12237979903809458, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78223973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78223979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172073 + ... + 172526.

It is an arithmetic number, because the mean of its divisors is an integer number (19642200).

Almost surely, 2^78223973 is an apocalyptic number.

It is an amenable number.

78223973 is a deficient number, since it is larger than the sum of its proper divisors (344827).

78223973 is a wasteful number, since it uses less digits than its factorization.

78223973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344826.

The product of its digits is 127008, while the sum is 41.

The square root of 78223973 is about 8844.4317511076. The cubic root of 78223973 is about 427.6744347028.

The spelling of 78223973 in words is "seventy-eight million, two hundred twenty-three thousand, nine hundred seventy-three".