78078533 has 16 divisors (see below), whose sum is σ = 85503600. Its totient is φ = 70869504.

The previous prime is 78078503. The next prime is 78078541. The reversal of 78078533 is 33587087.

It can be written as a sum of positive squares in 8 ways, for example, as 8305924 + 69772609 = 2882^2 + 8353^2 .

It is a cyclic number.

It is not a de Polignac number, because 78078533 - 2²⁰ = 77029957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78078503) 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, 334985 + ... + 335217.

It is an arithmetic number, because the mean of its divisors is an integer number (5343975).

Almost surely, 2^78078533 is an apocalyptic number.

It is an amenable number.

78078533 is a deficient number, since it is larger than the sum of its proper divisors (7425067).

78078533 is a wasteful number, since it uses less digits than its factorization.

78078533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 78078533 is about 8836.2058033977. The cubic root of 78078533 is about 427.4092152444.

The spelling of 78078533 in words is "seventy-eight million, seventy-eight thousand, five hundred thirty-three".