78773945 has 16 divisors (see below), whose sum is σ = 97873920. Its totient is φ = 60801600.

The previous prime is 78773921. The next prime is 78773957. The reversal of 78773945 is 54937787.

It is not a de Polignac number, because 78773945 - 2¹⁴ = 78757561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78773893 and 78773902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73715 + ... + 74775.

It is an arithmetic number, because the mean of its divisors is an integer number (6117120).

Almost surely, 2^78773945 is an apocalyptic number.

It is an amenable number.

78773945 is a deficient number, since it is larger than the sum of its proper divisors (19099975).

78773945 is a wasteful number, since it uses less digits than its factorization.

78773945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its digits is 1481760, while the sum is 50.

The square root of 78773945 is about 8875.4687200170. The cubic root of 78773945 is about 428.6743833871.

The spelling of 78773945 in words is "seventy-eight million, seven hundred seventy-three thousand, nine hundred forty-five".