78438286 has 8 divisors (see below), whose sum is σ = 117868104. Its totient is φ = 39148920.

The previous prime is 78438263. The next prime is 78438287. The reversal of 78438286 is 68283487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78438287) 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, 33705 + ... + 35956.

It is an arithmetic number, because the mean of its divisors is an integer number (14733513).

Almost surely, 2^78438286 is an apocalyptic number.

78438286 is a deficient number, since it is larger than the sum of its proper divisors (39429818).

78438286 is a wasteful number, since it uses less digits than its factorization.

78438286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70226.

The product of its digits is 516096, while the sum is 46.

The square root of 78438286 is about 8856.5391660626. The cubic root of 78438286 is about 428.0646501752.

It can be divided in two parts, 7843 and 8286, that added together give a square (16129 = 127²).

The spelling of 78438286 in words is "seventy-eight million, four hundred thirty-eight thousand, two hundred eighty-six".