78945851 has 6 divisors (see below), whose sum is σ = 79313052. Its totient is φ = 78580280.

The previous prime is 78945847. The next prime is 78945857. The reversal of 78945851 is 15854987.

It is not a de Polignac number, because 78945851 - 2² = 78945847 is a prime.

It is a super-2 number, since 2×78945851² = 12464894780228402, 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 = 78945796 and 78945805.

It is not an unprimeable number, because it can be changed into a prime (78945857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71816 + ... + 72906.

It is an arithmetic number, because the mean of its divisors is an integer number (13218842).

Almost surely, 2^78945851 is an apocalyptic number.

78945851 is a deficient number, since it is larger than the sum of its proper divisors (367201).

78945851 is an equidigital number, since it uses as much as digits as its factorization.

78945851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1360 counting only the distinct ones).

The product of its digits is 403200, while the sum is 47.

The square root of 78945851 is about 8885.1477759236. The cubic root of 78945851 is about 428.9859845491.

The spelling of 78945851 in words is "seventy-eight million, nine hundred forty-five thousand, eight hundred fifty-one".