78506 has 8 divisors (see below), whose sum is σ = 124740. Its totient is φ = 36928.

The previous prime is 78497. The next prime is 78509. The reversal of 78506 is 60587.

78506 = T₂₈ + T₂₉ + ... + T₇₈.

It can be written as a sum of positive squares in 2 ways, for example, as 70225 + 8281 = 265^2 + 91^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78509) 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, 1121 + ... + 1188.

2⁷⁸⁵⁰⁶ is an apocalyptic number.

78506 is a deficient number, since it is larger than the sum of its proper divisors (46234).

78506 is a wasteful number, since it uses less digits than its factorization.

78506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 78506 is about 280.1892217770. The cubic root of 78506 is about 42.8187794260.

The spelling of 78506 in words is "seventy-eight thousand, five hundred six".