78783673 has 4 divisors (see below), whose sum is σ = 80705268. Its totient is φ = 76862080.

The previous prime is 78783667. The next prime is 78783701. The reversal of 78783673 is 37638787.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37638787 = 23 ⋅1636469.

It can be written as a sum of positive squares in 2 ways, for example, as 4875264 + 73908409 = 2208^2 + 8597^2 .

It is a cyclic number.

It is not a de Polignac number, because 78783673 - 2¹³ = 78775481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78783613) 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, 960736 + ... + 960817.

It is an arithmetic number, because the mean of its divisors is an integer number (20176317).

Almost surely, 2^78783673 is an apocalyptic number.

It is an amenable number.

78783673 is a deficient number, since it is larger than the sum of its proper divisors (1921595).

78783673 is a wasteful number, since it uses less digits than its factorization.

78783673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921594.

The product of its digits is 1185408, while the sum is 49.

The square root of 78783673 is about 8876.0167304935. The cubic root of 78783673 is about 428.6920287001.

The spelling of 78783673 in words is "seventy-eight million, seven hundred eighty-three thousand, six hundred seventy-three".