78928319 has 4 divisors (see below), whose sum is σ = 78963696. Its totient is φ = 78892944.

The previous prime is 78928313. The next prime is 78928351. The reversal of 78928319 is 91382987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91382987 = 113 ⋅808699.

It is a cyclic number.

It is not a de Polignac number, because 78928319 - 2⁸ = 78928063 is a prime.

It is a super-2 number, since 2×78928319² = 12459359080331522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78928313) 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, 14099 + ... + 18884.

It is an arithmetic number, because the mean of its divisors is an integer number (19740924).

Almost surely, 2^78928319 is an apocalyptic number.

78928319 is a deficient number, since it is larger than the sum of its proper divisors (35377).

78928319 is a wasteful number, since it uses less digits than its factorization.

78928319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35376.

The product of its digits is 217728, while the sum is 47.

The square root of 78928319 is about 8884.1611309116. The cubic root of 78928319 is about 428.9542263292.

The spelling of 78928319 in words is "seventy-eight million, nine hundred twenty-eight thousand, three hundred nineteen".