78632783 has 4 divisors (see below), whose sum is σ = 78717288. Its totient is φ = 78548280.

The previous prime is 78632779. The next prime is 78632809. The reversal of 78632783 is 38723687.

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 78632783 - 2² = 78632779 is a prime.

It is a super-2 number, since 2×78632783² = 12366229124650178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78632483) 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, 40841 + ... + 42722.

It is an arithmetic number, because the mean of its divisors is an integer number (19679322).

Almost surely, 2^78632783 is an apocalyptic number.

78632783 is a deficient number, since it is larger than the sum of its proper divisors (84505).

78632783 is an equidigital number, since it uses as much as digits as its factorization.

78632783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84504.

The product of its digits is 338688, while the sum is 44.

The square root of 78632783 is about 8867.5127854433. The cubic root of 78632783 is about 428.4181704339.

The spelling of 78632783 in words is "seventy-eight million, six hundred thirty-two thousand, seven hundred eighty-three".