78258241 has 4 divisors (see below), whose sum is σ = 78412500. Its totient is φ = 78103984.

The previous prime is 78258209. The next prime is 78258277. The reversal of 78258241 is 14285287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43507216 + 34751025 = 6596^2 + 5895^2 .

It is a cyclic number.

It is not a de Polignac number, because 78258241 - 2⁵ = 78258209 is a prime.

It is a super-2 number, since 2×78258241² = 12248704568828162, which contains 22 as substring.

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 78258241.

It is not an unprimeable number, because it can be changed into a prime (78258281) 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, 76366 + ... + 77383.

It is an arithmetic number, because the mean of its divisors is an integer number (19603125).

Almost surely, 2^78258241 is an apocalyptic number.

It is an amenable number.

78258241 is a deficient number, since it is larger than the sum of its proper divisors (154259).

78258241 is a wasteful number, since it uses less digits than its factorization.

78258241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154258.

The product of its digits is 35840, while the sum is 37.

The square root of 78258241 is about 8846.3688030739. The cubic root of 78258241 is about 427.7368768051.

The spelling of 78258241 in words is "seventy-eight million, two hundred fifty-eight thousand, two hundred forty-one".