78218903 has 8 divisors (see below), whose sum is σ = 89518080. Its totient is φ = 66951000.

The previous prime is 78218869. The next prime is 78218909. The reversal of 78218903 is 30981287.

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 78218903 - 2¹⁴ = 78202519 is a prime.

It is a super-2 number, since 2×78218903² = 12236393573046818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2183 + ... + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (11189760).

Almost surely, 2^78218903 is an apocalyptic number.

78218903 is a deficient number, since it is larger than the sum of its proper divisors (11299177).

78218903 is a wasteful number, since it uses less digits than its factorization.

78218903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15637.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 78218903 is about 8844.1451254488. The cubic root of 78218903 is about 427.6651947552.

The spelling of 78218903 in words is "seventy-eight million, two hundred eighteen thousand, nine hundred three".