78747945 has 16 divisors (see below), whose sum is σ = 126107712. Its totient is φ = 41961920.

The previous prime is 78747941. The next prime is 78747953. The reversal of 78747945 is 54974787.

It is not a de Polignac number, because 78747945 - 2² = 78747941 is a prime.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (78747941) 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, 28735 + ... + 31355.

It is an arithmetic number, because the mean of its divisors is an integer number (7881732).

Almost surely, 2^78747945 is an apocalyptic number.

It is an amenable number.

78747945 is a deficient number, since it is larger than the sum of its proper divisors (47359767).

78747945 is a wasteful number, since it uses less digits than its factorization.

78747945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632.

The product of its digits is 1975680, while the sum is 51.

The square root of 78747945 is about 8874.0038877611. The cubic root of 78747945 is about 428.6272156744.

The spelling of 78747945 in words is "seventy-eight million, seven hundred forty-seven thousand, nine hundred forty-five".