78892945 has 4 divisors (see below), whose sum is σ = 94671540. Its totient is φ = 63114352.

The previous prime is 78892943. The next prime is 78892951. The reversal of 78892945 is 54929887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54929887 = 47 ⋅1168721.

It can be written as a sum of positive squares in 2 ways, for example, as 60949249 + 17943696 = 7807^2 + 4236^2 .

It is a cyclic number.

It is not a de Polignac number, because 78892945 - 2¹ = 78892943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78892892 and 78892901.

It is not an unprimeable number, because it can be changed into a prime (78892943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7889290 + ... + 7889299.

It is an arithmetic number, because the mean of its divisors is an integer number (23667885).

Almost surely, 2^78892945 is an apocalyptic number.

It is an amenable number.

78892945 is a deficient number, since it is larger than the sum of its proper divisors (15778595).

78892945 is a wasteful number, since it uses less digits than its factorization.

78892945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15778594.

The product of its digits is 1451520, while the sum is 52.

The square root of 78892945 is about 8882.1700614208. The cubic root of 78892945 is about 428.8901340219.

The spelling of 78892945 in words is "seventy-eight million, eight hundred ninety-two thousand, nine hundred forty-five".