78312422 has 4 divisors (see below), whose sum is σ = 117468636. Its totient is φ = 39156210.

The previous prime is 78312389. The next prime is 78312431. The reversal of 78312422 is 22421387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22421387 = 19 ⋅1180073.

It is a super-2 number, since 2×78312422² = 12265670879012168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19578104 + ... + 19578107.

It is an arithmetic number, because the mean of its divisors is an integer number (29367159).

Almost surely, 2^78312422 is an apocalyptic number.

78312422 is a deficient number, since it is larger than the sum of its proper divisors (39156214).

78312422 is a wasteful number, since it uses less digits than its factorization.

78312422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39156213.

The product of its digits is 5376, while the sum is 29.

The square root of 78312422 is about 8849.4306031518. The cubic root of 78312422 is about 427.8355665837.

The spelling of 78312422 in words is "seventy-eight million, three hundred twelve thousand, four hundred twenty-two".