78650 has 36 divisors (see below), whose sum is σ = 173166. Its totient is φ = 26400.

The previous prime is 78649. The next prime is 78653. The reversal of 78650 is 5687.

It can be written as a sum of positive squares in 3 ways, for example, as 43681 + 34969 = 209^2 + 187^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a d-powerful number, because it can be written as 7 + 8³ + 6 + 5⁷ + 0 .

It is a plaindrome in base 16.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (78653) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6044 + ... + 6056.

2⁷⁸⁶⁵⁰ is an apocalyptic number.

78650 is an abundant number, since it is smaller than the sum of its proper divisors (94516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86583).

78650 is a wasteful number, since it uses less digits than its factorization.

78650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47 (or 31 counting only the distinct ones).

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

The square root of 78650 is about 280.4460732476. The cubic root of 78650 is about 42.8449436178.

Multiplying 78650 by its sum of digits (26), we get a square (2044900 = 1430²).

78650 divided by its sum of digits (26) gives a square (3025 = 55²).

The spelling of 78650 in words is "seventy-eight thousand, six hundred fifty".