78945945 has 16 divisors (see below), whose sum is σ = 136030272. Its totient is φ = 38865600.

The previous prime is 78945929. The next prime is 78945949. The reversal of 78945945 is 54954987.

It is not a de Polignac number, because 78945945 - 2⁴ = 78945929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78945949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202231 + ... + 202620.

It is an arithmetic number, because the mean of its divisors is an integer number (8501892).

Almost surely, 2^78945945 is an apocalyptic number.

It is an amenable number.

78945945 is a deficient number, since it is larger than the sum of its proper divisors (57084327).

78945945 is a wasteful number, since it uses less digits than its factorization.

78945945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404872.

The product of its digits is 1814400, while the sum is 51.

The square root of 78945945 is about 8885.1530656483. The cubic root of 78945945 is about 428.9861548121.

The spelling of 78945945 in words is "seventy-eight million, nine hundred forty-five thousand, nine hundred forty-five".