78125281 has 8 divisors (see below), whose sum is σ = 86092160. Its totient is φ = 70438032.

The previous prime is 78125279. The next prime is 78125287. The reversal of 78125281 is 18252187.

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 78125281 - 2¹ = 78125279 is a prime.

It is a super-2 number, since 2×78125281² = 12207119062657922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78125287) 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, 69321 + ... + 70438.

It is an arithmetic number, because the mean of its divisors is an integer number (10761520).

Almost surely, 2^78125281 is an apocalyptic number.

It is an amenable number.

78125281 is a deficient number, since it is larger than the sum of its proper divisors (7966879).

78125281 is a wasteful number, since it uses less digits than its factorization.

78125281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139815.

The product of its digits is 8960, while the sum is 34.

The square root of 78125281 is about 8838.8506605780. The cubic root of 78125281 is about 427.4944992054.

It can be divided in two parts, 781 and 25281, that added together give a palindrome (26062).

The spelling of 78125281 in words is "seventy-eight million, one hundred twenty-five thousand, two hundred eighty-one".