78520333 has 4 divisors (see below), whose sum is σ = 79596028. Its totient is φ = 77444640.

The previous prime is 78520231. The next prime is 78520349. The reversal of 78520333 is 33302587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33302587 = 31 ⋅1074277.

It can be written as a sum of positive squares in 2 ways, for example, as 42484324 + 36036009 = 6518^2 + 6003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78520333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78520295 and 78520304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78520363) 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, 537738 + ... + 537883.

It is an arithmetic number, because the mean of its divisors is an integer number (19899007).

Almost surely, 2^78520333 is an apocalyptic number.

78520333 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

It is an amenable number.

78520333 is a deficient number, since it is larger than the sum of its proper divisors (1075695).

78520333 is a wasteful number, since it uses less digits than its factorization.

78520333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075694.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 78520333 is about 8861.1699566141. The cubic root of 78520333 is about 428.2138510459.

The spelling of 78520333 in words is "seventy-eight million, five hundred twenty thousand, three hundred thirty-three".