78550 has 12 divisors (see below), whose sum is σ = 146196. Its totient is φ = 31400.

The previous prime is 78541. The next prime is 78553. The reversal of 78550 is 5587.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 736 + ... + 835.

It is an arithmetic number, because the mean of its divisors is an integer number (12183).

2⁷⁸⁵⁵⁰ is an apocalyptic number.

78550 is a deficient number, since it is larger than the sum of its proper divisors (67646).

78550 is a wasteful number, since it uses less digits than its factorization.

78550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583 (or 1578 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 78550 is about 280.2677291448. The cubic root of 78550 is about 42.8267774322.

The spelling of 78550 in words is "seventy-eight thousand, five hundred fifty".