78229331 has 4 divisors (see below), whose sum is σ = 78447600. Its totient is φ = 78011064.

The previous prime is 78229301. The next prime is 78229343. The reversal of 78229331 is 13392287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13392287 = 29 ⋅461803.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78229331 is a prime.

It is a super-2 number, since 2×78229331² = 12239656457415122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78229291 and 78229300.

It is not an unprimeable number, because it can be changed into a prime (78229301) 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, 108596 + ... + 109313.

It is an arithmetic number, because the mean of its divisors is an integer number (19611900).

Almost surely, 2^78229331 is an apocalyptic number.

78229331 is a deficient number, since it is larger than the sum of its proper divisors (218269).

78229331 is a wasteful number, since it uses less digits than its factorization.

78229331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218268.

The product of its digits is 18144, while the sum is 35.

The square root of 78229331 is about 8844.7346483657. The cubic root of 78229331 is about 427.6841990893.

The spelling of 78229331 in words is "seventy-eight million, two hundred twenty-nine thousand, three hundred thirty-one".