78215233 has 8 divisors (see below), whose sum is σ = 82054080. Its totient is φ = 74452560.

The previous prime is 78215219. The next prime is 78215261. The reversal of 78215233 is 33251287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78215233 - 2¹⁷ = 78084161 is a prime.

It is a super-2 number, since 2×78215233² = 12235245346488578, 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 = 78215195 and 78215204.

It is not an unprimeable number, because it can be changed into a prime (78215633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16935 + ... + 21052.

It is an arithmetic number, because the mean of its divisors is an integer number (10256760).

Almost surely, 2^78215233 is an apocalyptic number.

It is an amenable number.

78215233 is a deficient number, since it is larger than the sum of its proper divisors (3838847).

78215233 is a wasteful number, since it uses less digits than its factorization.

78215233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38087.

The product of its digits is 10080, while the sum is 31.

The square root of 78215233 is about 8843.9376411189. The cubic root of 78215233 is about 427.6585060233.

The spelling of 78215233 in words is "seventy-eight million, two hundred fifteen thousand, two hundred thirty-three".