78810045 has 16 divisors (see below), whose sum is σ = 133513920. Its totient is φ = 39559424.

The previous prime is 78810031. The next prime is 78810049. The reversal of 78810045 is 54001887.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78810045 - 2⁶ = 78809981 is a prime.

It is a super-2 number, since 2×78810045² = 12422046385804050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78809988 and 78810015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78810049) 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, 154275 + ... + 154784.

It is an arithmetic number, because the mean of its divisors is an integer number (8344620).

Almost surely, 2^78810045 is an apocalyptic number.

It is an amenable number.

78810045 is a deficient number, since it is larger than the sum of its proper divisors (54703875).

78810045 is a wasteful number, since it uses less digits than its factorization.

78810045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309084.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 78810045 is about 8877.5021824835. The cubic root of 78810045 is about 428.7398567357.

The spelling of 78810045 in words is "seventy-eight million, eight hundred ten thousand, forty-five".