78290321 has 8 divisors (see below), whose sum is σ = 86500224. Its totient is φ = 70480960.

The previous prime is 78290299. The next prime is 78290339. The reversal of 78290321 is 12309287.

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 78290321 - 2¹⁰ = 78289297 is a prime.

It is a super-2 number, since 2×78290321² = 12258748724566082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78290021) 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 7 ways as a sum of consecutive naturals, for example, 99725 + ... + 100506.

It is an arithmetic number, because the mean of its divisors is an integer number (10812528).

Almost surely, 2^78290321 is an apocalyptic number.

It is an amenable number.

78290321 is a deficient number, since it is larger than the sum of its proper divisors (8209903).

78290321 is a wasteful number, since it uses less digits than its factorization.

78290321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200271.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 78290321 is about 8848.1817906279. The cubic root of 78290321 is about 427.7953154832.

The spelling of 78290321 in words is "seventy-eight million, two hundred ninety thousand, three hundred twenty-one".