78243201 has 6 divisors (see below), whose sum is σ = 113017970. Its totient is φ = 52162128.

The previous prime is 78243181. The next prime is 78243241. The reversal of 78243201 is 10234287.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 4626801 = 8580^2 + 2151^2 .

It is not a de Polignac number, because 78243201 - 2⁵ = 78243169 is a prime.

It is a super-2 number, since 2×78243201² = 12243997005452802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78243241) 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, 4346836 + ... + 4346853.

Almost surely, 2^78243201 is an apocalyptic number.

It is an amenable number.

78243201 is a deficient number, since it is larger than the sum of its proper divisors (34774769).

78243201 is a wasteful number, since it uses less digits than its factorization.

78243201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693695 (or 8693692 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 78243201 is about 8845.5186959273. The cubic root of 78243201 is about 427.7094736217.

Adding to 78243201 its reverse (10234287), we get a palindrome (88477488).

It can be divided in two parts, 7824 and 3201, that added together give a square (11025 = 105²).

The spelling of 78243201 in words is "seventy-eight million, two hundred forty-three thousand, two hundred one".