78783 has 4 divisors (see below), whose sum is σ = 105048. Its totient is φ = 52520.

The previous prime is 78781. The next prime is 78787. The reversal of 78783 is 38787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78783 - 2¹ = 78781 is a prime.

It is a super-2 number, since 2×78783² = 12413522178, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 16.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78781) 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, 13128 + ... + 13133.

It is an arithmetic number, because the mean of its divisors is an integer number (26262).

2⁷⁸⁷⁸³ is an apocalyptic number.

78783 is a deficient number, since it is larger than the sum of its proper divisors (26265).

78783 is a wasteful number, since it uses less digits than its factorization.

78783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26264.

The product of its digits is 9408, while the sum is 33.

The square root of 78783 is about 280.6830953228. The cubic root of 78783 is about 42.8690808013.

It can be divided in two parts, 78 and 783, that added together give a triangular number (861 = T₄₁).

The spelling of 78783 in words is "seventy-eight thousand, seven hundred eighty-three".