78747321 has 8 divisors (see below), whose sum is σ = 105468160. Its totient is φ = 52262352.

The previous prime is 78747299. The next prime is 78747341. The reversal of 78747321 is 12374787.

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

It is not a de Polignac number, because 78747321 - 2⁶ = 78747257 is a prime.

It is a super-2 number, since 2×78747321² = 12402281129354082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78747321.

It is not an unprimeable number, because it can be changed into a prime (78747341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58186 + ... + 59523.

It is an arithmetic number, because the mean of its divisors is an integer number (13183520).

Almost surely, 2^78747321 is an apocalyptic number.

It is an amenable number.

78747321 is a deficient number, since it is larger than the sum of its proper divisors (26720839).

78747321 is a wasteful number, since it uses less digits than its factorization.

78747321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117935.

The product of its digits is 65856, while the sum is 39.

The square root of 78747321 is about 8873.9687288158. The cubic root of 78747321 is about 428.6260835217.

The spelling of 78747321 in words is "seventy-eight million, seven hundred forty-seven thousand, three hundred twenty-one".