78551 has 8 divisors (see below), whose sum is σ = 88464. Its totient is φ = 69120.
The previous prime is 78541. The next prime is 78553. The reversal of 78551 is 15587.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 78551 - 26 = 78487 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 78551.
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 7 ways as a sum of consecutive naturals, for example, 311 + ... + 503.
It is an arithmetic number, because the mean of its divisors is an integer number (11058).
278551 is an apocalyptic number.
78551 is a deficient number, since it is larger than the sum of its proper divisors (9913).
78551 is a wasteful number, since it uses less digits than its factorization.
78551 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 241.
The product of its digits is 1400, while the sum is 26.
The square root of 78551 is about 280.2695131476. The cubic root of 78551 is about 42.8269591703.
It can be divided in two parts, 7 and 8551, that added together give a palindrome (8558).
The spelling of 78551 in words is "seventy-eight thousand, five hundred fifty-one".
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